| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 56.78 | 116 |
| 2015 | 55.61 | 117 |
| 2014 | 54.41 | 117 |
| 2013 | 53.17 | 125 |
| 2012 | 51.89 | 129 |
| 2011 | 50.57 | 130 |
| 2010 | 49.23 | 132 |
| 2009 | 47.88 | 134 |
| 2008 | 46.54 | 135 |
| 2007 | 45.2 | 137 |
| 2006 | 43.87 | 139 |
| 2005 | 42.52 | 141 |
| 2004 | 41.14 | 142 |
| 2003 | 39.78 | 143 |
| 2002 | 38.43 | 146 |
| 2001 | 37.09 | 150 |
| 2000 | 35.88 | 149 |
| 1999 | 34.87 | 154 |
| 1998 | 33.87 | 155 |
| 1997 | 32.88 | 159 |
| 1996 | 31.92 | 162 |
| 1995 | 30.96 | 162 |
| 1994 | 30.02 | 166 |
| 1993 | 29.1 | 169 |
| 1992 | 28.2 | 172 |
| 1991 | 27.31 | 172 |
| 1990 | 26.44 | 172 |
| 1989 | 25.7 | 172 |
| 1988 | 24.97 | 173 |
| 1987 | 24.26 | 173 |
| 1986 | 23.56 | 173 |