| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 59.435 | 91 |
| 2014 | 57.394 | 103 |
| 2013 | 56.526 | 106 |
| 2012 | 56.275 | 104 |
| 2011 | 53.332 | 110 |
| 2010 | 55.9 | 107 |
| 2009 | 55.238 | 111 |
| 2008 | 53.599 | 110 |
| 2007 | 51.88 | 114 |
| 2006 | 52.147 | 111 |
| 2005 | 54.159 | 107 |
| 2004 | 54.181 | 107 |
| 2003 | 55.571 | 96 |
| 2002 | 55.894 | 98 |
| 2001 | 55.803 | 97 |
| 2000 | 55.413 | 96 |
| 1999 | 53.668 | 95 |
| 1998 | 50.966 | 100 |
| 1997 | 47.216 | 111 |
| 1996 | 47.185 | 106 |
| 1995 | 45.031 | 116 |
| 1994 | 43.633 | 104 |
| 1993 | 24.005 | 131 |
| 1992 | 27.22 | 126 |
| 1991 | 31.566 | 116 |
| 1990 | 28.124 | 120 |
| 1989 | 26.274 | 107 |
| 1988 | 35.795 | 89 |
| 1987 | 42.422 | 75 |
| 1986 | 37.016 | 86 |