| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 11 | 99 |
| 2015 | 11 | 114 |
| 2014 | 13 | 111 |
| 2013 | 13 | 113 |
| 2012 | 12 | 113 |
| 2011 | 11 | 114 |
| 2010 | 8 | 120 |
| 2009 | 9 | 118 |
| 2008 | 10 | 117 |
| 2007 | 9 | 116 |
| 2006 | 9 | 112 |
| 2005 | 9 | 106 |
| 2004 | 8 | 109 |
| 2003 | 8 | 107 |
| 2002 | 7 | 109 |
| 2001 | 7 | 103 |
| 2000 | 6 | 105 |
| 1999 | 7 | 101 |
| 1998 | 9 | 91 |
| 1997 | 10 | 90 |
| 1996 | 10 | 86 |
| 1995 | 14 | 78 |
| 1994 | 16 | 64 |
| 1993 | 16 | 60 |
| 1992 | 19 | 59 |
| 1991 | 17 | 61 |
| 1990 | 23 | 55 |