| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 119 | 67 |
| 2015 | 111 | 80 |
| 2014 | 112 | 83 |
| 2013 | 101 | 89 |
| 2012 | 85 | 92 |
| 2011 | 77 | 93 |
| 2010 | 64 | 94 |
| 2009 | 53 | 96 |
| 2008 | 56 | 96 |
| 2007 | 43 | 101 |
| 2006 | 39 | 97 |
| 2005 | 33 | 94 |
| 2004 | 27 | 98 |
| 2003 | 24 | 93 |
| 2002 | 21 | 93 |
| 2001 | 19 | 99 |
| 2000 | 18 | 100 |
| 1999 | 18 | 96 |
| 1998 | 18 | 94 |
| 1997 | 10 | 111 |
| 1996 | 8 | 112 |
| 1995 | 7 | 117 |
| 1994 | 6 | 99 |
| 1993 | 6 | 100 |
| 1992 | 7 | 94 |
| 1991 | 8 | 95 |
| 1990 | 7 | 96 |