88 Dialog Semiconductor Plc | Annual report and accounts 2012  |  Section 4 | Consolidated financial statements and notes Notes to the consolidated financial statements For the year ended 31 December 2012  11. Property, plant and equipment, net  A summary of activity for property, plant and equipment for the years ended 31 December 2012 and 2011 is as follows:  The carrying value of property, plant and equipment held under finance leases at 31 December 2012 was US$628,000 (31 December 2011:  US$606,000). Additions during the year were US$506,000 (2011: nil). As of the reporting date future minimum lease payments under those finance  lease contracts were US$221,000 (2011: US$457,000). The present value of the net minimum lease payments was US$211,000 (2011: US$431,000).  Finance leases  Test equipment US$000 Leasehold  improvements US$000 Office and other  equipment US$000 Construction in  progress  US$000  Total US$000 Cost  Balance at 31 December 2010 / 1 January 2011  77,932 2,487 23,777 210  104,406 Additions relating to the SiTel acquisition  1,711 757 418 –  2,886 Effect of movements in foreign currency  (8) (47) (89) (3) (147) Additions  7,290 4,467 8,844 301  20,902 Reclassifications  – 207 34 (241) – Disposals  (1,193) (254) (8,323) –  (9,770) Balance at 31 December 2011 / 1 January 2012  85,732 7,617 24,661 267  118,277 Effect of movements in foreign currency  19 85 177 1  282 Additions  23,744 2,007 9,284 13  35,048 Reclassifications  – 22 242 (264) – Disposals  (1,297) (101) (1,786) (5) (3,189) Balance at 31 December 2012  108,198 9,630 32,578 12  150,418 Depreciation and impairment losses  Balance at 31 December 2010 / 1 January 2011  (71,997) (571) (17,589) –  (90,157) Effect of movements in foreign currency  8 37 65 –  110 Depreciation charge for the year  (3,846) (983) (3,972) –  (8,801) Disposals  1,151 107 7,717 –  8,975 Balance at 31 December 2011 / 1 January 2012  (74,684) (1,410) (13,779) –  (89,873) Effect of movements in foreign currency  (9) (25) (70) –  (104) Depreciation charge for the year  (6,030) (1,221) (5,447) –  (12,698) Disposals  1,114 16 1,445 –  2,575 Balance at 31 December 2012  (79,609) (2,640) (17,851) –  (100,100) Net book value  At 31 December 2010 / 1 January 2011  5,935 1,916 6,188 210  14,249 At 31 December 2011 / 1 January 2012  11,048 6,207 10,882 267  28,404 At 31 December 2012  28,589 6,990 14,727 12  50,318