| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 46.77 | 115 |
| 2015 | 44.05 | 131 |
| 2014 | 45.62 | 139 |
| 2013 | 45.03 | 141 |
| 2012 | 46.96 | 137 |
| 2011 | 49.97 | 133 |
| 2010 | 55.09 | 109 |
| 2009 | 50.09 | 116 |
| 2008 | 62.86 | 106 |
| 2007 | 72.62 | 75 |
| 2006 | 83.04 | 52 |
| 2005 | 88.04 | 44 |
| 2004 | 93.88 | 38 |
| 2003 | 93.92 | 33 |
| 2002 | 93.78 | 29 |
| 2001 | 88.62 | 36 |
| 2000 | 94.8 | 27 |
| 1999 | 83.31 | 40 |
| 1998 | 84.35 | 37 |
| 1997 | 77.12 | 48 |
| 1996 | 65.82 | 64 |
| 1995 | 61.85 | 70 |
| 1994 | 56.09 | 72 |
| 1993 | 55 | 68 |
| 1992 | 47.6 | 83 |
| 1991 | 47.69 | 76 |
| 1990 | 47.75 | 83 |
| 1989 | 44.45 | 88 |
| 1988 | 41.58 | 89 |
| 1987 | 38.54 | 95 |
| 1986 | 34.03 | 102 |