| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 32.91 | 150 |
| 2015 | 35.73 | 157 |
| 2014 | 41.04 | 152 |
| 2013 | 43.29 | 148 |
| 2012 | 45.17 | 146 |
| 2011 | 48.09 | 141 |
| 2010 | 48.75 | 128 |
| 2009 | 43.2 | 136 |
| 2008 | 55.74 | 127 |
| 2007 | 61.27 | 107 |
| 2006 | 63.97 | 92 |
| 2005 | 62.2 | 89 |
| 2004 | 59.05 | 97 |
| 2003 | 51.26 | 109 |
| 2002 | 42.21 | 136 |
| 2001 | 38.05 | 144 |
| 2000 | 39.15 | 139 |
| 1999 | 32.96 | 151 |
| 1998 | 31.48 | 155 |
| 1997 | 33.81 | 151 |
| 1996 | 33.56 | 151 |
| 1995 | 38.24 | 134 |
| 1994 | 41.93 | 112 |
| 1993 | 44 | 93 |
| 1992 | 38.77 | 107 |
| 1991 | 35.4 | 103 |
| 1990 | 31.99 | 122 |
| 1989 | 32.11 | 117 |
| 1988 | 32.91 | 112 |
| 1987 | 30.28 | 114 |
| 1986 | 24.55 | 126 |