| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 74 | 46 |
| 2015 | 70 | 65 |
| 2014 | 78 | 63 |
| 2013 | 64 | 65 |
| 2012 | 66 | 64 |
| 2011 | 67 | 62 |
| 2010 | 57 | 62 |
| 2009 | 53 | 61 |
| 2008 | 56 | 63 |
| 2007 | 45 | 62 |
| 2006 | 36 | 63 |
| 2005 | 31 | 63 |
| 2004 | 28 | 59 |
| 2003 | 23 | 58 |
| 2002 | 19 | 56 |
| 2001 | 17 | 58 |
| 2000 | 15 | 61 |
| 1999 | 15 | 56 |
| 1998 | 15 | 56 |
| 1997 | 13 | 58 |
| 1996 | 13 | 58 |
| 1995 | 13 | 53 |
| 1994 | 12 | 51 |
| 1993 | 10 | 52 |
| 1992 | 11 | 46 |
| 1991 | 10 | 46 |
| 1990 | 9 | 48 |
| 1989 | 8 | 50 |
| 1988 | 7 | 48 |
| 1987 | 6 | 50 |
| 1986 | 5 | 56 |