end holidays. For example, over the past 10 years, excluding certain recovery years, our first fiscal quarter revenues have ranged 2%-17% below the fourth quarter of the prior fiscal years. This historical pattern should not be considered a reliable indicator of the Company's future net sales or financial performance. Our workforce is distributed globally over 19 countries. As of fiscal 2020 year-end, we had approximately 4,875 employees worldwide, with approximately 827 located in the Asia-Pacific region, 2,500 in the EMEA region, and 1,548 in the Americas region. Of our total workforce, approximately 597 employees are involved in research and development; 3,120 employees are involved in operations, manufacturing, service and quality assurance; and 1,158 employees are involved in sales, order administration, marketing, finance, information technology, general management and other administrative functions. Our success will depend in large part upon our ability to attract and retain employees. We face competition in this regard from other companies, research and academic institutions, government entities and other organizations. We consider our relations with our employees to be good. Our human capital is governed by various federal, state and local regulations. We monitor all key employment activities, such as hiring, termination and pay practices to ensure compliance with established regulations across the world. We embrace diversity and inclusion and strive to provide an environment rich with diverse skills, backgrounds and perspectives. Within the United States we conduct a yearly review of employees and establish hiring goals for minority, female, disabled and military veteran candidates. Our recruitment programs are regionally focused and hiring is done at a local level to ensure compliance with specific regulations. To ensure diversity within our workforce we advertise job openings and source candidates broadly to attract a diverse candidate pool. As a leader in our industry we are able to attract a strong candidate pool and have been successful in filing vacancies to ensure business continuity. In fiscal 2020 we had 350 new hires, 155 of which were within the EMEA region, 134 of which were within the Americas region and 61 of which were in the Asia-Pacific region. During fiscal 2020, we also conducted a worldwide organizational health survey designed to assess employee engagement, leadership, work environment and culture. We had a response rate of 77% of our total worldwide employee base, which is one indicator of a high-level of employee engagement. We track and report internally on key talent metrics including workforce demographics, talent pipeline, diversity data, and engagement of our employees. We believe in investing in professional development programs to ensure we provide opportunities for individuals to advance their careers either in a technical track or move to a leadership position. We offer many of our in-class training programs digitally so that more employees can benefit from self-development during a period when many of our employees are working remotely. Additional focus is placed on the development of our future leaders and we leverage a talent review process where high-potential and high-performing employees are assessed for future leadership roles as part of our succession management process for critical leadership positions. As employee turnover is an indicator of employee satisfaction we closely monitor turnover globally and benchmark locally. Coherent has a very stable and committed workforce. This translates into very low voluntary turnover when compared to benchmark data. Our 12 month rolling average for voluntary turnover at the end of fiscal 2020 stood at 5.2%, substantially less than benchmark data. Our employee average tenure globally is more than 10 years. On October 5, 2018, we acquired privately held Ondax for approximately $12.0 million, excluding transaction costs. Ondax develops and produces photonic components which are used on an OEM basis by the laser industry as well as incorporated into its own stabilized lasers and Raman Spectroscopy systems. On October 5, 2018, we acquired certain assets of Quantum for approximately $7.0 million, excluding transaction costs. On March 8, 2018, we acquired privately held OR Laser for approximately $47.4 million, excluding transaction costs. OR Laser produces laser- based material processing equipment for a variety of uses, including additive manufacturing, welding, cladding, marking, engraving and drilling. Please refer to Note 4, "Business Combinations" of Notes to Consolidated Financial Statements under Item 8 of this annual report for further discussion of recent acquisitions completed. In the first quarter of fiscal 2017, we began the implementation of planned restructuring activities in connection with the acquisition of Rofin. The activities to date under this plan primarily related to exiting our legacy high power fiber laser product line, change of control payments to Rofin officers, the exiting of two product lines acquired in the acquisition of Rofin, realignment of our supply chain due to segment reorganization and consolidation of sales and distribution offices as well as 22 RESTRUCTURINGS AND CONSOLIDATION ACQUISITIONS EMPLOYEES