| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 32 | 135 |
| 2014 | 37 | 134 |
| 2013 | 38 | 136 |
| 2012 | 34 | 138 |
| 2011 | 29 | 141 |
| 2010 | 25 | 141 |
| 2009 | 23 | 141 |
| 2008 | 22 | 143 |
| 2007 | 15 | 147 |
| 2006 | 11 | 150 |
| 2005 | 9 | 152 |
| 2004 | 8 | 154 |
| 2003 | 5 | 161 |
| 2002 | 4 | 160 |
| 2001 | 3 | 162 |
| 2000 | 3 | 163 |
| 1999 | 4 | 149 |
| 1998 | 6 | 142 |
| 1997 | 3 | 157 |
| 1996 | 3 | 155 |
| 1995 | 3 | 156 |
| 1994 | 4 | 127 |
| 1993 | 4 | 117 |
| 1992 | 5 | 110 |
| 1991 | 7 | 111 |
| 1990 | 8 | 107 |