| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.13 | 94 |
| 2015 | 60.05 | 84 |
| 2014 | 74.04 | 64 |
| 2013 | 86.24 | 49 |
| 2012 | 97.7 | 35 |
| 2011 | 105.77 | 30 |
| 2010 | 95.87 | 28 |
| 2009 | 92.48 | 29 |
| 2008 | 104.2 | 33 |
| 2007 | 105.4 | 28 |
| 2006 | 103.68 | 33 |
| 2005 | 101.68 | 32 |
| 2004 | 30.23 | 177 |
| 2003 | 28.85 | 175 |
| 2002 | 29.46 | 164 |
| 2001 | 31 | 163 |
| 2000 | 34.44 | 156 |
| 1999 | 35.76 | 143 |
| 1998 | 36.13 | 147 |
| 1997 | 34.89 | 147 |
| 1996 | 34.47 | 148 |
| 1995 | 32.75 | 155 |
| 1994 | 31.89 | 148 |
| 1993 | 31.21 | 128 |
| 1992 | 31.41 | 127 |
| 1991 | 29.02 | 128 |
| 1990 | 29.2 | 131 |
| 1989 | 22.03 | 139 |
| 1988 | 17.92 | 139 |
| 1987 | 24.37 | 135 |
| 1986 | 23.21 | 131 |