| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 30 | 114 |
| 2015 | 26 | 124 |
| 2014 | 29 | 123 |
| 2013 | 36 | 121 |
| 2012 | 43 | 116 |
| 2011 | 44 | 119 |
| 2010 | 36 | 116 |
| 2009 | 29 | 115 |
| 2008 | 35 | 116 |
| 2007 | 34 | 114 |
| 2006 | 28 | 114 |
| 2005 | 24 | 112 |
| 2004 | 25 | 105 |
| 2003 | 23 | 103 |
| 2002 | 20 | 100 |
| 2001 | 18 | 101 |
| 2000 | 25 | 93 |
| 1999 | 20 | 92 |
| 1998 | 18 | 92 |
| 1997 | 16 | 100 |
| 1996 | 17 | 98 |
| 1995 | 19 | 88 |
| 1994 | 16 | 89 |
| 1993 | 14 | 83 |
| 1992 | 15 | 81 |
| 1991 | 12 | 81 |
| 1990 | 11 | 86 |
| 1989 | 8 | 94 |
| 1988 | 7 | 94 |
| 1987 | 6 | 95 |
| 1986 | 5 | 100 |