| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 108 | 34 |
| 2015 | 110 | 39 |
| 2014 | 136 | 38 |
| 2013 | 161 | 36 |
| 2012 | 137 | 35 |
| 2011 | 134 | 37 |
| 2010 | 101 | 39 |
| 2009 | 84 | 44 |
| 2008 | 124 | 34 |
| 2007 | 94 | 36 |
| 2006 | 81 | 36 |
| 2005 | 79 | 35 |
| 2004 | 70 | 35 |
| 2003 | 54 | 37 |
| 2002 | 55 | 34 |
| 2001 | 55 | 32 |
| 2000 | 45 | 40 |
| 1999 | 38 | 47 |
| 1998 | 51 | 36 |
| 1997 | 63 | 32 |
| 1996 | 54 | 36 |
| 1995 | 66 | 31 |
| 1994 | 77 | 25 |
| 1993 | 141 | 13 |
| 1992 | 154 | 13 |
| 1991 | 191 | 13 |
| 1990 | 199 | 11 |
| 1989 | 184 | 10 |
| 1988 | 150 | 10 |
| 1987 | 133 | 11 |