| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 271.2 | 44 |
| 2015 | 259.6 | 48 |
| 2014 | 259.2 | 48 |
| 2013 | 257.2 | 51 |
| 2012 | 269.7 | 47 |
| 2011 | 268.5 | 46 |
| 2010 | 266.8 | 46 |
| 2009 | 280.6 | 44 |
| 2008 | 270.5 | 44 |
| 2007 | 253.5 | 43 |
| 2006 | 252.4 | 43 |
| 2005 | 265.1 | 40 |
| 2004 | 255.6 | 40 |
| 2003 | 279.2 | 38 |
| 2002 | 254.5 | 39 |
| 2001 | 265 | 38 |
| 2000 | 277.4 | 38 |
| 1999 | 280.6 | 37 |
| 1998 | 240.2 | 38 |
| 1997 | 257.7 | 36 |
| 1996 | 255.5 | 35 |
| 1995 | 262.8 | 35 |
| 1994 | 237.2 | 35 |
| 1993 | 228.6 | 35 |
| 1992 | 225.8 | 34 |
| 1991 | 239.1 | 34 |
| 1990 | 271.1 | 33 |