Item 6. Selected Financial Data  Dollars in Millions, Except Per Share Data Shares and per share amounts have been retrospectively adjusted for all periods presented for the two-for-one stock split on December  11, 2012. See Note 1 to the consolidated financial statements, "Summary of Significant Accounting Policies", for additional  information. 21  Income Statement Data: 2013 2012 2011 2010 2009 Net sales ............................................................................... $ 1,018.2 $ 996.8 $ 1,032.9 $ 989.2 $ 897.5 Cost of goods sold................................................................ 784.5 774.5 818.7 779.3 740.6 Production margin ........................................................... 233.7 222.3 214.2 209.9 156.9 Marketing and administrative expenses ............................... 89.2 88.5 91.2 89.4 90.3 Research and development expenses ................................... 20.1 20.2 19.3 19.4 19.7 Insurance settlement (gain) .................................................. (2.5) -- -- -- -- Impairment of assets ............................................................ -- -- -- -- 39.8 Restructuring and other costs ............................................... -- -- (0.4) 0.8 22.0 Income (loss) from operations......................................... 126.9 113.6 104.1 100.3 (14.9)  Non-operating income (deductions), net .............................. (3.2) (3.0) (2.7) 0.4 (6.3) Income (loss) from continuing operations before provision (benefit) for taxes on income (loss) ................ 123.7 110.6 101.4 100.7 (21.2)  Provision (benefit) for taxes on income (loss) ..................... 34.5 31.9 28.7 29.6 (4.8)  Income (loss) from continuing operations....................... 89.2 78.7 72.7 71.1 (16.4)  Loss from discontinued operations, net of tax................. (5.8) (2.5) (2.5) (1.2) (4.5) Consolidated net income (loss) ...................................... 83.4 76.2 70.2 69.9 (20.9)  Less: Net income attributable to  non-controlling interests......................................... (3.1) (2.1) (2.7) (3.0) (2.9)  Net income (loss) attributable to Minerals  Technologies Inc. (MTI) ....................................... $ 80.3 $ 74.1 $ 67.5 $ 66.9 $ (23.8) Earnings Per Share Basic:  Earnings (loss) from continuing operations attributable to MTI………………………………….. $ 2.48 $ 2.17 $ 1.94 $ 1.83 $ (0.52) Loss from discontinued operations attributable to MTI………………………………….. (0.17 )  (0.07 )  (0.07 )  (0.03 )  (0.12)  Basic earnings (loss) per share attributable to MTI......... $ 2.31 $ 2.10 $ 1.87 $ 1.80 $ (0.64) Diluted: Earnings (loss) from continuing operations attributable to MTI………………………………….. $ 2.46 $ 2.16 $ 1.93 $ 1.82 $ (0.52) Loss from discontinued operations attributable to MTI………………………………….. (0.16 )  (0.07 )  (0.07 )  (0.03)  (0.12)  Diluted earnings (loss) per share attributable to MTI...... $ 2.30 $ 2.09 $ 1.86 $ 1.79 $ (0.64) Weighted average number of common shares outstanding: Basic .............................................................................. 34,690 35,340 36,018 37,228 37,448 Diluted ........................................................................... 34,976 35,529 36,236 37,386 37,448 Dividends declared per common share ................................ $ 0.20 $ 0.125 $ 0.10 $ 0.10 $ 0.10 Balance Sheet Data: Working capital.................................................................... $ 634.2 $ 514.4 $ 539.4 $ 520.3 $ 447.8 Total assets ........................................................................... 1,217.5 1,211.2 1,165.0 1,116.1 1,072.1 Long-term debt..................................................................... 75.0 8.5 85.4 92.6 92.6 Total debt ............................................................................. 88.7 92.6 99.8 97.2 104.1 Total shareholders' equity .................................................... 874.4 813.7 768.0 782.7 747.7