| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 421 | 1 |
| 2015 | 668.6 | 1 |
| 2014 | 497.8 | 1 |
| 2013 | 459.6 | 1 |
| 2012 | 410 | 1 |
| 2011 | 578.2 | 1 |
| 2010 | 650.6 | 1 |
| 2009 | 660.3 | 1 |
| 2008 | 715.2 | 1 |
| 2007 | 952.7 | 1 |
| 2006 | 390.4 | 1 |
| 2005 | 232 | 2 |
| 2004 | 238.8 | 1 |
| 2003 | 169.1 | 1 |
| 2002 | 107.6 | 4 |
| 2001 | 140.6 | 4 |
| 2000 | 217.3 | 4 |
| 1999 | 137.3 | 5 |
| 1998 | 121.9 | 3 |
| 1997 | 255.4 | 1 |
| 1996 | 104.1 | 2 |
| 1995 | 66.1 | 5 |
| 1994 | 92.6 | 2 |
| 1993 | 109.8 | 2 |
| 1992 | 75.2 | 1 |
| 1991 | 43.3 | 1 |
| 1990 | 45 | 4 |
| 1989 | 50.3 | 3 |
| 1988 | 39.2 | 4 |
| 1987 | 89.7 | 2 |
| 1986 | 37.3 | 4 |