| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 22 | 117 |
| 2015 | 21 | 142 |
| 2014 | 20 | 145 |
| 2013 | 19 | 149 |
| 2012 | 17 | 151 |
| 2011 | 17 | 152 |
| 2010 | 17 | 151 |
| 2009 | 16 | 151 |
| 2008 | 14 | 151 |
| 2007 | 13 | 153 |
| 2006 | 10 | 152 |
| 2005 | 8 | 154 |
| 2004 | 9 | 150 |
| 2003 | 8 | 147 |
| 2002 | 7 | 143 |
| 2001 | 6 | 144 |
| 2000 | 5 | 149 |
| 1999 | 4 | 147 |
| 1998 | 4 | 151 |
| 1997 | 4 | 150 |
| 1996 | 3 | 150 |
| 1995 | 3 | 153 |