| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 21.2 | 150 |
| 2015 | 20.54 | 149 |
| 2014 | 20.05 | 149 |
| 2013 | 19.69 | 150 |
| 2012 | 19.44 | 151 |
| 2011 | 19.26 | 152 |
| 2010 | 19.13 | 153 |
| 2009 | 19.19 | 154 |
| 2008 | 19.33 | 158 |
| 2007 | 19.5 | 160 |
| 2006 | 19.6 | 160 |
| 2005 | 19.57 | 160 |
| 2004 | 19.31 | 160 |
| 2003 | 18.89 | 160 |
| 2002 | 18.37 | 157 |
| 2001 | 17.82 | 154 |
| 2000 | 17.27 | 152 |
| 1999 | 16.74 | 152 |
| 1998 | 16.23 | 151 |
| 1997 | 15.71 | 148 |
| 1996 | 15.19 | 147 |
| 1995 | 14.67 | 146 |
| 1994 | 14.12 | 145 |
| 1993 | 13.62 | 144 |
| 1992 | 13.16 | 142 |
| 1991 | 12.76 | 141 |
| 1990 | 12.43 | 141 |
| 1989 | 12.15 | 141 |
| 1988 | 11.93 | 141 |
| 1987 | 11.77 | 142 |
| 1986 | 11.66 | 142 |