| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 63.26 | 69 |
| 2015 | 53.22 | 102 |
| 2014 | 67.98 | 78 |
| 2013 | 73.43 | 72 |
| 2012 | 58.77 | 105 |
| 2011 | 48.14 | 140 |
| 2010 | 46.54 | 136 |
| 2009 | 51.84 | 111 |
| 2008 | 57.94 | 119 |
| 2007 | 50.68 | 133 |
| 2006 | 46.9 | 142 |
| 2005 | 45.79 | 139 |
| 2004 | 40.73 | 153 |
| 2003 | 40.86 | 140 |
| 2002 | 31.53 | 159 |
| 2001 | 58.96 | 82 |
| 2000 | 52.25 | 104 |
| 1999 | 63.4 | 69 |
| 1998 | 54.04 | 90 |
| 1997 | 49.49 | 109 |
| 1996 | 48.44 | 105 |
| 1995 | 62.97 | 68 |
| 1994 | 70.99 | 44 |
| 1993 | 41.82 | 101 |
| 1992 | 62.85 | 49 |
| 1991 | 53.19 | 60 |
| 1990 | 52.74 | 69 |
| 1989 | 48.42 | 78 |
| 1988 | 50.29 | 70 |
| 1987 | 48.35 | 74 |
| 1986 | 42.92 | 83 |