| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 33 | 113 |
| 2015 | 33 | 133 |
| 2014 | 35 | 136 |
| 2013 | 34 | 138 |
| 2012 | 32 | 139 |
| 2011 | 28 | 143 |
| 2010 | 22 | 146 |
| 2009 | 22 | 142 |
| 2008 | 22 | 142 |
| 2007 | 16 | 145 |
| 2006 | 12 | 148 |
| 2005 | 10 | 147 |
| 2004 | 8 | 151 |
| 2003 | 7 | 151 |
| 2002 | 6 | 151 |
| 2001 | 5 | 151 |
| 2000 | 4 | 157 |
| 1999 | 4 | 150 |
| 1998 | 6 | 140 |
| 1997 | 5 | 141 |
| 1996 | 5 | 136 |
| 1995 | 6 | 133 |
| 1994 | 5 | 117 |
| 1993 | 5 | 112 |
| 1992 | 5 | 113 |
| 1991 | 7 | 108 |
| 1990 | 8 | 105 |