| 季度 | 单位：百万美元 |
| 2012-03 | 购买后可见 » |
| 2011-12 | 购买后可见 » |
| 2011-09 | 购买后可见 » |
| 2011-06 | 购买后可见 » |
| 2011-03 | 购买后可见 » |
| 2010-12 | 购买后可见 » |
| 2010-09 | 购买后可见 » |
| 2010-06 | 购买后可见 » |
| 2010-03 | 购买后可见 » |
| 2009-12 | 购买后可见 » |
| 2009-09 | 购买后可见 » |
| 2009-06 | 购买后可见 » |
| 2009-03 | 购买后可见 » |
| 2008-12 | 购买后可见 » |
| 2008-09 | 购买后可见 » |
| 2008-06 | 购买后可见 » |
| 2008-03 | 购买后可见 » |
| 2007-12 | 购买后可见 » |
| 2007-09 | 购买后可见 » |
| 2007-06 | 购买后可见 » |
| 2007-03 | 26.09 |
| 2006-12 | 31.42 |
| 2006-09 | 28.73 |
| 2006-06 | 26.54 |
| 2006-03 | 19.32 |
| 2005-12 | 8.66 |
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