| Top Holders
| | | Shares Held | % O/S | Share Change | Filing Date | | The Vanguard Group, Inc. | 43,315,229 | 5.0 | 758,873 | 03/31/13 | | State Street Global Advisors (US) | 42,962,587 | 4.9 | -240,544 | 03/31/13 | | BlackRock Institutional Trust Company, N.A. | 36,044,654 | 4.1 | 1,875,485 | 03/31/13 | | Invesco Advisers, Inc. | 29,818,953 | 3.4 | 183,372 | 12/31/12 | | Columbia Management Investment Advisers, LLC | 17,220,560 | 2.0 | 3,044,147 | 12/31/12 | | NFJ Investment Group LLC | 16,987,740 | 1.9 | 7,142,840 | 12/31/12 | | BlackRock Financial Management, Inc. | 15,181,353 | 1.7 | 8,004,007 | 03/31/13 | | JP Morgan Asset Management | 15,170,985 | 1.7 | 1,903,569 | 03/31/13 | | Aronson Johnson & Ortiz, L.P. | 14,906,390 | 1.7 | -384,700 | 12/31/12 | | Robeco Investment Management, Inc. | 14,507,640 | 1.7 | 583,013 | 12/31/12 |
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