We expect to continue to adjust tariffs and offer a variety of promotional packages from time to time in response to increasing  competition and in order to take advantage of our pricing power from economies of scale. We may also be required to adjust our  pricing due to changes in domestic regulations. In recent years, we have focused on modernizing and upgrading our mobile services network and on developing our FTTx  network, which enables transmission of digital information at a high bandwidth over fiber loops. In particular, we have enhanced our  telecommunications services through:  As a result, we made aggregate capital expenditures of NT$132.2 billion over the period from January 1, 2007 to December  31, 2011.  Our long-term goal is to optimize our capital expenditures by focusing on investing in innovative products and services with  attractive return profiles. We evaluate our investment opportunities by benchmarking them against internal return requirements. We  are currently finalizing plans for the gradual upgrade of our entire public switched telephone network to a next-generation network.  Next-generation internet protocol switches will have substantially more capacity and greater upgrade flexibility and should result  in increased operational efficiencies from reduced switching centers and related property, materials and personnel costs. We have  also devoted resources toward the effective upgrade of our 3G mobile network to 3.5G and HSPA+ and the continuing build-out  of our FTTx infrastructure. In addition, we are planning to deploy green internet Data Centers and service delivery network for the  innovative services, such as cloud computing, fixed mobile convergence services and four-screen digital convergence services.  Personnel expenses constitute a significant portion of our operating costs and expenses. In 2009, 2010 and 2011, personnel  expenses represented 29.4%, 30.4% and 27.6% of our total operating costs and expenses, respectively, and pension costs represented  1.9%, 2.0% and 1.8% of our total operating costs and expenses, respectively. The table below sets forth information regarding our  personnel expenses and as a percentage of our total operating costs and expenses for the periods indicated.  Provisions for pension payments to our employees  Capital expenditures as a result of technological improvements and changes in our business  ●  the introduction of a IP-based exchange system in our long distance telephone network;  ●  the implementation of a network modernization program, including a gradual transfer from our public switched telephone  network to a system based on internet protocol, to remain at the forefront of new technologies;  ●  the deployment of an intelligent NGN network for fixed line and multimedia services;  ●  the development and deployment of Green IDC for meeting the new demands of cloud computing services;  ●  the deployment of a high-capacity long-haul reconfigurable optical add drop multiplexing system and a nationwide internet  protocol backbone network with hundreds of Gbps switching routers for internet and managed IP services; and  ●  the expansion and upgrade of our mobile services network as well as WiFi/Femtocell to improve indoor 3G mobile network  coverage and transmission speed for mobile internet.  69 2009 2010 2011 (in billions of NT$, except percentages) Personnel expenses: Salaries 22.4 15.8% 22.9 15.8% 23.6 14.6% Insurance 1.8 1.3 1.9 1.3 2.0 1.2 Pension 2.7 1.9 2.9 2.0 3.0 1.8 Other 14.8 10.4 16.4 11.3 16.2 10.0 Total personnel expenses 41.7 29.4% 44.1 30.4% 44.8 27.6% Total operating costs and expenses 142.0 100.0% 145.0 100.0% 162.4 100.0% For the year ended December 31, P AR T I