| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 61.4 | 72 |
| 2015 | 54.63 | 95 |
| 2014 | 45.84 | 138 |
| 2013 | 43.89 | 146 |
| 2012 | 44.93 | 148 |
| 2011 | 46.91 | 145 |
| 2010 | 47.63 | 134 |
| 2009 | 57.5 | 90 |
| 2008 | 60.91 | 111 |
| 2007 | 53.05 | 127 |
| 2006 | 60.55 | 106 |
| 2005 | 47.32 | 136 |
| 2004 | 45.27 | 136 |
| 2003 | 41.98 | 138 |
| 2002 | 41.77 | 137 |
| 2001 | 42.65 | 137 |
| 2000 | 41.54 | 136 |
| 1999 | 46.27 | 113 |
| 1998 | 48.42 | 104 |
| 1997 | 50.41 | 104 |
| 1996 | 52.21 | 95 |
| 1995 | 52.59 | 93 |
| 1994 | 51.99 | 83 |
| 1993 | 53.7 | 70 |
| 1992 | 54.04 | 62 |
| 1991 | 53.48 | 59 |
| 1990 | 72.6 | 39 |
| 1989 | 64.37 | 48 |
| 1988 | 59.91 | 44 |
| 1987 | 66.5 | 34 |
| 1986 | 63.19 | 40 |