| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 223 | 75 |
| 2014 | 265 | 73 |
| 2013 | 283 | 74 |
| 2012 | 258 | 75 |
| 2011 | 215 | 77 |
| 2010 | 131 | 87 |
| 2009 | 114 | 86 |
| 2008 | 163 | 83 |
| 2007 | 126 | 85 |
| 2006 | 116 | 85 |
| 2005 | 103 | 82 |
| 2004 | 82 | 84 |
| 2003 | 62 | 86 |
| 2002 | 56 | 82 |
| 2001 | 48 | 85 |
| 2000 | 51 | 81 |
| 1999 | 42 | 87 |
| 1998 | 40 | 91 |
| 1997 | 44 | 83 |
| 1996 | 46 | 80 |
| 1995 | 41 | 81 |
| 1994 | 41 | 76 |
| 1993 | 42 | 73 |
| 1992 | 46 | 67 |
| 1991 | 44 | 64 |
| 1990 | 40 | 66 |
| 1989 | 34 | 59 |
| 1988 | 29 | 59 |
| 1987 | 30 | 62 |
| 1986 | 26 | 62 |