| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 126.9 | 5 |
| 2015 | 142.4 | 4 |
| 2014 | 104.5 | 4 |
| 2013 | 102.2 | 4 |
| 2012 | 89 | 6 |
| 2011 | 118.9 | 4 |
| 2010 | 150.6 | 3 |
| 2009 | 142.8 | 5 |
| 2008 | 256.1 | 3 |
| 2007 | 263.8 | 3 |
| 2006 | 18.9 | 35 |
| 2005 | 13.9 | 36 |
| 2004 | 11.1 | 38 |
| 2003 | 127.5 | 3 |
| 2002 | 163 | 1 |
| 2001 | 210.5 | 2 |
| 2000 | 233.4 | 3 |
| 1999 | 160.5 | 3 |
| 1998 | 233.3 | 1 |
| 1997 | 188.5 | 2 |
| 1996 | 126 | 1 |
| 1995 | 93.4 | 1 |
| 1994 | 87.6 | 3 |
| 1993 | 71 | 3 |
| 1992 | 26.7 | 8 |
| 1991 | 28.2 | 6 |
| 1990 | 155.6 | 1 |
| 1989 | 205.3 | 1 |
| 1988 | 186.1 | 1 |
| 1987 | 221.1 | 1 |
| 1986 | 84.7 | 1 |