| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2014 | 169.29 | 116 |
| 2013 | 154.13 | 120 |
| 2012 | 153.92 | 117 |
| 2011 | 128.73 | 127 |
| 2010 | 97.16 | 132 |
| 2009 | 81.05 | 138 |
| 2008 | 80 | 138 |
| 2007 | 63.41 | 139 |
| 2006 | 55.28 | 138 |
| 2005 | 48.66 | 140 |
| 2004 | 39.27 | 142 |
| 2003 | 35.36 | 139 |
| 2002 | 30 | 143 |
| 2001 | 30.81 | 136 |
| 2000 | 35.21 | 131 |
| 1999 | 34.77 | 129 |
| 1998 | 37.89 | 124 |
| 1997 | 49.37 | 112 |
| 1996 | 51.55 | 108 |
| 1995 | 46.36 | 110 |
| 1994 | 55.03 | 95 |
| 1993 | 49.75 | 99 |
| 1992 | 43.78 | 102 |
| 1991 | 37.87 | 106 |
| 1990 | 32.2 | 110 |
| 1989 | 35.46 | 97 |
| 1988 | 36.56 | 95 |
| 1987 | 31.44 | 94 |
| 1986 | 26.48 | 96 |