| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 34.46 | 153 |
| 2015 | 31.79 | 160 |
| 2014 | 30.77 | 164 |
| 2013 | 29.9 | 166 |
| 2012 | 28.51 | 165 |
| 2011 | 25.77 | 170 |
| 2010 | 22.59 | 172 |
| 2009 | 20.26 | 171 |
| 2008 | 19.23 | 172 |
| 2007 | 17.4 | 173 |
| 2006 | 14.58 | 176 |
| 2005 | 8.25 | 181 |
| 2004 | 7.86 | 181 |
| 2003 | 7.42 | 179 |
| 2002 | 7.22 | 178 |
| 2001 | 6.96 | 176 |
| 2000 | 7.13 | 175 |
| 1999 | 6.95 | 172 |
| 1998 | 7.18 | 171 |
| 1997 | 7.49 | 167 |
| 1996 | 7.05 | 168 |
| 1995 | 6.22 | 168 |
| 1994 | 5.41 | 162 |
| 1993 | 4.42 | 163 |
| 1992 | 3.68 | 162 |
| 1991 | 3.37 | 161 |
| 1990 | 3.97 | 157 |
| 1989 | 3.8 | 144 |
| 1988 | 4.14 | 140 |
| 1987 | 3.55 | 139 |
| 1986 | 5.05 | 131 |