| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 74.3 | 60 |
| 2015 | 72.7 | 70 |
| 2014 | 73.7 | 69 |
| 2013 | 74.2 | 72 |
| 2012 | 75 | 71 |
| 2011 | 73.6 | 71 |
| 2010 | 72.9 | 71 |
| 2009 | 72.9 | 68 |
| 2008 | 74.1 | 68 |
| 2007 | 71.3 | 67 |
| 2006 | 70 | 67 |
| 2005 | 69 | 67 |
| 2004 | 67.6 | 66 |
| 2003 | 65.1 | 65 |
| 2002 | 63 | 66 |
| 2001 | 60 | 66 |
| 2000 | 57.5 | 65 |
| 1999 | 52.3 | 63 |
| 1998 | 53.1 | 63 |
| 1997 | 52.1 | 62 |
| 1996 | 47.7 | 63 |
| 1995 | 46.8 | 63 |