| Top Holders
| | | Shares Held | % O/S | Share Change | Filing Date | | The Vanguard Group, Inc. | 8,429,771 | 6.2 | 441,401 | 03/31/13 | | Wellington Management Company, LLP | 7,339,038 | 5.4 | -1,435,062 | 04/30/13 | | Harris Associates L.P. | 7,082,738 | 5.2 | 354,500 | 03/31/13 | | State Street Global Advisors (US) | 5,957,449 | 4.4 | -100,755 | 03/31/13 | | BlackRock Institutional Trust Company, N.A. | 5,552,766 | 4.1 | 134,332 | 03/31/13 | | T. Rowe Price Associates, Inc. | 4,900,995 | 3.6 | -2,918,827 | 03/31/13 | | Jennison Associates LLC | 3,927,317 | 2.9 | 159,138 | 03/31/13 | | Herndon Capital Management, LLC | 3,834,811 | 2.8 | 2,167,102 | 03/31/13 | | SouthernSun Asset Management, LLC | 3,604,128 | 2.7 | 1,456,404 | 03/31/13 | | Cortland Advisers LLC | 3,300,000 | 2.4 | 0 | 03/31/13 |
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