| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 9 | 115 |
| 2014 | 10 | 121 |
| 2013 | 9 | 124 |
| 2012 | 11 | 117 |
| 2011 | 7 | 125 |
| 2010 | 7 | 120 |
| 2009 | 6 | 120 |
| 2008 | 5 | 125 |
| 2007 | 6 | 119 |
| 2006 | 5 | 115 |
| 2005 | 4 | 118 |
| 2004 | 5 | 106 |
| 2003 | 4 | 105 |
| 2002 | 3 | 111 |
| 2001 | 3 | 107 |
| 2000 | 2 | 117 |
| 1999 | 3 | 104 |
| 1998 | 3 | 97 |
| 1997 | 4 | 88 |
| 1996 | 3 | 88 |
| 1995 | 3 | 88 |
| 1994 | 2 | 90 |
| 1993 | 2 | 89 |
| 1992 | 2 | 88 |
| 1991 | 1 | 87 |
| 1990 | 1 | 90 |