103 24. Segmental reporting continued  The following table shows for 2011 the Company’s former Audio & Power Management Segment, the former Display Segment and the combination of  both into the new Mobile Systems Segment:  2011  Audio & Power  Management  US$000  Display Systems US$000 Total US$000 Revenues $^{1)}$  369,211  1,715 370,926 R&D expenses  56,763  5,302 62,065 Operating profit (loss) $^{2)}$  69,960  (10,146) 59,814 Depreciation/  amortisation  16,915  1,556 18,471 Inventory impairment and fixed asset disposal losses  3,876  156 4,032 Investments  21,907  2,015 23,922 At 31 Dec 2011  Inventories  45,505  296 45,801 [1] All revenues are from sales to external customers  [2] Certain overhead costs are predominantly allocated based on sales and headcount  b) Geographic information – Revenues by shipment destination  2012 US$000 2011 US$000 Revenues  United Kingdom  2,317 3,499 Other European countries 72,722 83,399 China  600,991 336,910 Other Asian countries  90,294 83,941 Other countries 7,259 19,512 Total revenues  773,583 527,261 Investments  Germany 38,278 25,371 Japan  41 785 United Kingdom  3,044 3,034 Netherlands  3,391 2,612 USA  22,686 110 Taiwan  420 8 Singapore  369 92 Other  233 146 Total investments  68,462 32,158