| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.634 | 100 |
| 2015 | 50.236 | 132 |
| 2014 | 47.837 | 138 |
| 2013 | 46.697 | 146 |
| 2012 | 45.307 | 143 |
| 2011 | 44.165 | 147 |
| 2010 | 44.074 | 147 |
| 2009 | 44.33 | 146 |
| 2008 | 42.817 | 144 |
| 2007 | 42.856 | 145 |
| 2006 | 41.816 | 147 |
| 2005 | 41.335 | 145 |
| 2004 | 41.182 | 147 |
| 2003 | 42.027 | 140 |
| 2002 | 42.247 | 139 |
| 2001 | 41.222 | 143 |
| 2000 | 39.786 | 142 |
| 1999 | 38.574 | 139 |
| 1998 | 37.042 | 144 |
| 1997 | 35.004 | 145 |
| 1996 | 33.569 | 144 |
| 1995 | 33.652 | 142 |
| 1994 | 34.362 | 124 |
| 1993 | 34.515 | 118 |
| 1992 | 35.555 | 111 |
| 1991 | 34.478 | 113 |
| 1990 | 32.382 | 110 |
| 1989 | 32.891 | 98 |
| 1988 | 31.236 | 98 |
| 1987 | 30.359 | 101 |
| 1986 | 29.846 | 100 |