| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 202 | 54 |
| 2015 | 211 | 62 |
| 2014 | 193 | 66 |
| 2013 | 176 | 70 |
| 2012 | 157 | 71 |
| 2011 | 138 | 78 |
| 2010 | 119 | 77 |
| 2009 | 102 | 77 |
| 2008 | 86 | 84 |
| 2007 | 60 | 89 |
| 2006 | 47 | 88 |
| 2005 | 30 | 100 |
| 2004 | 27 | 97 |
| 2003 | 21 | 102 |
| 2002 | 19 | 101 |
| 2001 | 23 | 90 |
| 2000 | 28 | 84 |
| 1999 | 36 | 75 |
| 1998 | 34 | 75 |
| 1997 | 34 | 73 |
| 1996 | 36 | 69 |
| 1995 | 32 | 70 |
| 1994 | 31 | 55 |
| 1993 | 41 | 53 |
| 1992 | 47 | 48 |
| 1991 | 50 | 46 |
| 1990 | 45 | 48 |