| Top Holders
| | | Shares Held | % O/S | Share Change | Filing Date | | The Vanguard Group, Inc. | 7,519,676 | 12.2 | 376,404 | 03/31/13 | | BlackRock Institutional Trust Company, N.A. | 3,725,933 | 6.1 | 304,752 | 03/31/13 | | Invesco Advisers, Inc. | 3,575,424 | 5.8 | -417,441 | 12/31/12 | | T. Rowe Price Associates, Inc. | 3,351,980 | 5.5 | 708,310 | 12/31/12 | | ClearBridge Investments, LLC | 3,210,008 | 5.2 | 732,622 | 12/31/12 | | Wellington Management Company, LLP | 2,786,698 | 4.5 | 327,360 | 12/31/12 | | Lord, Abbett & Co. LLC | 2,506,270 | 4.1 | -1,066,455 | 02/28/13 | | CBRE Clarion Securities, LLC | 2,409,581 | 3.9 | 1,600 | 12/31/12 | | Principal Global Investors (Equity) | 2,246,463 | 3.7 | 1,511,707 | 03/31/13 | | Harvard Management Company, Inc. | 1,945,714 | 3.2 | -651,638 | 03/31/13 |
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