| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.54 | 134 |
| 2015 | 50.37 | 135 |
| 2014 | 49.17 | 136 |
| 2013 | 47.94 | 136 |
| 2012 | 46.68 | 137 |
| 2011 | 45.39 | 137 |
| 2010 | 44.08 | 140 |
| 2009 | 42.74 | 143 |
| 2008 | 41.42 | 145 |
| 2007 | 40.1 | 148 |
| 2006 | 38.8 | 150 |
| 2005 | 37.52 | 151 |
| 2004 | 36.26 | 154 |
| 2003 | 35.01 | 157 |
| 2002 | 33.78 | 161 |
| 2001 | 32.57 | 165 |
| 2000 | 31.39 | 167 |
| 1999 | 30.97 | 167 |
| 1998 | 30.8 | 167 |
| 1997 | 30.62 | 166 |
| 1996 | 30.45 | 165 |
| 1995 | 30.28 | 166 |
| 1994 | 30.11 | 165 |
| 1993 | 29.93 | 165 |
| 1992 | 29.76 | 165 |
| 1991 | 29.59 | 164 |
| 1990 | 29.42 | 162 |
| 1989 | 29.17 | 159 |
| 1988 | 28.9 | 158 |
| 1987 | 28.63 | 157 |
| 1986 | 28.36 | 157 |