Second quarter   First six months
  2013 2012*   2013 2012*
Net sales Volvo Group, SEK M 72,756 82,943   131,100 160,746
Operating income Volvo Group, SEK M 3,262 7,709   3,744 13,949
  Operating income Industrial Operations, SEK M 2,846 7,322   2,947 13,228
  Operating income Customer Finance, SEK M 416 387   797 721
Operating margin Volvo Group, % 4.5 9.3   2.9 8.7
Income after financial items, SEK M 2,880 6,796   2,779 12,418
Income for the period, SEK M 2,086 4,972   1,838 9,097
Diluted earnings per share, SEK 0.99 2.41   0.84 4.41
Operating Cash Flow in Industrial Operations, SEK Bn 4.1 2.5   (3.5) (2.4)
Return on shareholders' equity, rolling 12 months,%       5.4 22.5

*Restated according to new accounting principles. See Volvo Group Annual Report 2012 Note 31.