First quarter
  2012 2011
Net sales Volvo Group, SEK M 78,838 71,577
Operating income Volvo Group, SEK M 6,239 6,522
  Operating income Industrial Operations, SEK M 5,906 6,335
  Operating income Customer Finance, SEK M 333 187
Operating margin Volvo Group, % 7.9 9.1
Income after financial items, SEK M 5,602 5,847
Income for the period, SEK M 4,092 4,181
Diluted earnings per share, SEK 1.98 2.01
Return on shareholders' equity, rolling 12 months,% 22.1 19.0
Operating Cash Flow in Industrial Operations, SEK Bn (4.9) (4.0)