| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 54.42 | 143 |
| 2015 | 63.73 | 147 |
| 2014 | 60.55 | 150 |
| 2013 | 55.19 | 154 |
| 2012 | 60.28 | 150 |
| 2011 | 80.03 | 142 |
| 2010 | 69.6 | 144 |
| 2009 | 61.91 | 143 |
| 2008 | 53.21 | 149 |
| 2007 | 44.32 | 150 |
| 2006 | 39.98 | 150 |
| 2005 | 36.56 | 149 |
| 2004 | 34.76 | 149 |
| 2003 | 32.09 | 144 |
| 2002 | 34.96 | 133 |
| 2001 | 17.17 | 148 |
| 2000 | 17.44 | 148 |
| 1999 | 17.76 | 148 |
| 1998 | 17.51 | 147 |
| 1997 | 26.63 | 136 |
| 1996 | 22.81 | 143 |
| 1995 | 13.97 | 153 |
| 1994 | 11.82 | 146 |
| 1993 | 20.71 | 128 |
| 1992 | 18 | 133 |
| 1991 | 22.04 | 131 |
| 1990 | 18.81 | 136 |
| 1989 | 15.9 | 121 |
| 1988 | 13.8 | 124 |
| 1987 | 11.83 | 123 |
| 1986 | 11.84 | 120 |