| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 96.95 | 65 |
| 2014 | 102.83 | 60 |
| 2013 | 99.16 | 74 |
| 2012 | 100.22 | 77 |
| 2011 | 104.21 | 67 |
| 2010 | 106.05 | 56 |
| 2009 | 118.53 | 30 |
| 2008 | 122.79 | 44 |
| 2007 | 125.06 | 40 |
| 2006 | 128.65 | 30 |
| 2005 | 132.67 | 27 |
| 2004 | 144.18 | 15 |
| 2003 | 170.41 | 11 |
| 2002 | 163.53 | 12 |
| 2001 | 160.88 | 11 |
| 2000 | 151.24 | 14 |
| 1999 | 146.27 | 11 |
| 1998 | 151.95 | 11 |
| 1997 | 137.5 | 16 |
| 1996 | 139.99 | 15 |
| 1995 | 133.76 | 17 |
| 1994 | 136.54 | 17 |
| 1993 | 133.66 | 15 |
| 1992 | 133.44 | 19 |
| 1991 | 129.9 | 18 |
| 1990 | 127.9 | 21 |
| 1989 | 171 | 7 |
| 1988 | 157.14 | 7 |
| 1987 | 163.95 | 8 |
| 1986 | 148.54 | 8 |