P AR T I 39 We provide interconnection of our fixed line network and mobile network with other operators. Our others business segment include revenues from our non-telecom services, including property sales made by our  subsidiary Light Era Development Co., Ltd..  Our international other services include corporate solution services.  In addition, we have two satellite communication centers that enable us to provide satellite value-added services and backup  systems for use in major emergencies. We also provide satellite services to Southeast Asia. We entered into a contract with ST-2 Satellite Ventures Pte., Ltd. on March 12, 2010 to lease capacity on the ST-2  satellite. The lease term is 15 years starting from the official start of operations of the ST-2 satellite, and the total contract value  is approximately NT$6.0 billion (US$198.2 million). This contract requires a prepayment of NT $3.1 billion (US$101.4 million),  and the remaining amount will be paid annually when ST-2 satellite starts its official operation. The ST-2 telecommunications  satellite launched on May 21, 2011 and began commercial operation in August 2011. We stopped commercial operation of the ST-1  telecommunications satellite at the end of 2011 when the ST-2 satellite began commercial operations. Please refer to note 29 of our  consolidated financial statements included elsewhere in this annual report for further details. Our international data services include international IP VPN services and Taiwan internet gateway services. Total revenues  for international data services were NT$0.8 billion, NT$1.0 billion and NT$1.1 billion (US$37.4 million) for 2009, 2010 and 2011  respectively. Due to growth of the international corporations in Taiwan, we expect demand for IP VPN and Taiwan internet gateway  services to continue to increase and our revenues from our international data services to continue to grow.  We continue to experience a decline in rental fees for all of our leased line products. The decline in rental fees since 2000 has  been substantial, particularly for international leased lines, partly as a result of competition from new international leased line service  providers. In response, we continue to implement marketing and service campaigns to retain our high-value corporate customers.  Rental fees for international long distance leased line are generally based on transmission speed and distance.  The following table shows the bandwidth of international lines leased to third parties as of each of the dates indicated.  As of December 31, 2009 2010 2011 (in gigabits per second, or Gbps) Total bandwidth 63.1 113.4 243.9 We provide data transmission services to major corporate customers in Taiwan. Since August 2001, licenses have been  awarded to four undersea cable operators to engage in leased line services. Demand for high-speed data transmission services has  been growing rapidly, as a result of growing consumer demand and lower tariffs due to increased competition. In particular, the total  bandwidth of our lines leased increased by 115% in 2011.  International Data Services  Satellite Services  Interconnection  Others  International Other Services 