| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 144 | 79 |
| 2015 | 148 | 89 |
| 2014 | 171 | 87 |
| 2013 | 178 | 87 |
| 2012 | 168 | 87 |
| 2011 | 142 | 92 |
| 2010 | 112 | 92 |
| 2009 | 117 | 83 |
| 2008 | 114 | 94 |
| 2007 | 82 | 101 |
| 2006 | 54 | 105 |
| 2005 | 41 | 107 |
| 2004 | 39 | 107 |
| 2003 | 31 | 106 |
| 2002 | 28 | 101 |
| 2001 | 32 | 99 |
| 2000 | 30 | 100 |
| 1999 | 31 | 96 |
| 1998 | 34 | 95 |
| 1997 | 44 | 82 |
| 1996 | 48 | 79 |
| 1995 | 49 | 74 |
| 1994 | 27 | 88 |
| 1993 | 40 | 75 |
| 1992 | 56 | 62 |
| 1991 | 54 | 62 |
| 1990 | 64 | 59 |