| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 35 | 109 |
| 2014 | 28 | 120 |
| 2013 | 19 | 134 |
| 2012 | 17 | 136 |
| 2011 | 15 | 140 |
| 2010 | 14 | 139 |
| 2009 | 16 | 127 |
| 2008 | 25 | 117 |
| 2007 | 25 | 115 |
| 2006 | 21 | 113 |
| 2005 | 13 | 125 |
| 2004 | 9 | 135 |
| 2003 | 8 | 132 |
| 2002 | 7 | 130 |
| 2001 | 7 | 128 |
| 2000 | 8 | 124 |
| 1999 | 8 | 120 |
| 1998 | 8 | 121 |
| 1997 | 9 | 117 |
| 1996 | 8 | 115 |
| 1995 | 9 | 111 |
| 1994 | 9 | 90 |
| 1993 | 9 | 90 |
| 1992 | 8 | 90 |
| 1991 | 7 | 97 |