| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.78 | 34 |
| 2015 | 83.2 | 37 |
| 2014 | 96.15 | 35 |
| 2013 | 108.7 | 26 |
| 2012 | 119.68 | 21 |
| 2011 | 112.54 | 21 |
| 2010 | 100.78 | 24 |
| 2009 | 94.95 | 24 |
| 2008 | 109.58 | 28 |
| 2007 | 99.87 | 35 |
| 2006 | 101.3 | 36 |
| 2005 | 162.62 | 7 |
| 2004 | 158.33 | 7 |
| 2003 | 146.79 | 8 |
| 2002 | 145.34 | 8 |
| 2001 | 152.52 | 7 |
| 2000 | 150.28 | 9 |
| 1999 | 144.37 | 7 |
| 1998 | 142.71 | 8 |
| 1997 | 163.65 | 6 |
| 1996 | 162.03 | 6 |
| 1995 | 157.97 | 7 |
| 1994 | 177.86 | 5 |
| 1993 | 203.04 | 4 |
| 1992 | 199.3 | 5 |
| 1991 | 164.83 | 7 |
| 1990 | 143.22 | 6 |
| 1989 | 127.71 | 9 |
| 1988 | 107.78 | 10 |
| 1987 | 142.98 | 5 |
| 1986 | 90.16 | 18 |