| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 37.27 | 149 |
| 2015 | 41.38 | 155 |
| 2014 | 44.86 | 157 |
| 2013 | 45.76 | 159 |
| 2012 | 48.07 | 157 |
| 2011 | 48.2 | 158 |
| 2010 | 44.39 | 158 |
| 2009 | 35.8 | 163 |
| 2008 | 32.94 | 164 |
| 2007 | 34.69 | 162 |
| 2006 | 32.91 | 157 |
| 2005 | 31.78 | 152 |
| 2004 | 27.7 | 153 |
| 2003 | 21.98 | 154 |
| 2002 | 14.32 | 160 |
| 2001 | 15.42 | 153 |
| 2000 | 17.38 | 149 |
| 1999 | 15.48 | 152 |
| 1998 | 15.77 | 154 |
| 1997 | 17.17 | 150 |
| 1996 | 16.03 | 150 |
| 1995 | 16.99 | 147 |
| 1994 | 14.19 | 140 |
| 1993 | 13.57 | 142 |
| 1992 | 12.85 | 144 |
| 1991 | 11.56 | 146 |
| 1990 | 11.15 | 145 |
| 1989 | 6.97 | 138 |
| 1988 | 6.92 | 137 |
| 1987 | 5.84 | 136 |
| 1986 | 4.49 | 134 |