| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 68 | 96 |
| 2015 | 64 | 117 |
| 2014 | 59 | 121 |
| 2013 | 51 | 128 |
| 2012 | 41 | 133 |
| 2011 | 28 | 142 |
| 2010 | 24 | 143 |
| 2009 | 21 | 143 |
| 2008 | 19 | 147 |
| 2007 | 15 | 148 |
| 2006 | 12 | 146 |
| 2005 | 10 | 146 |
| 2004 | 9 | 147 |
| 2003 | 7 | 149 |
| 2002 | 6 | 147 |
| 2001 | 7 | 138 |
| 2000 | 7 | 139 |
| 1999 | 3 | 155 |
| 1998 | 3 | 156 |
| 1997 | 4 | 148 |
| 1996 | 5 | 141 |
| 1995 | 4 | 142 |
| 1994 | 4 | 129 |
| 1993 | 3 | 127 |
| 1992 | 2 | 128 |
| 1991 | 3 | 125 |
| 1990 | 2 | 123 |
| 1989 | 2 | 108 |