| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 62.88 | 148 |
| 2015 | 63.54 | 147 |
| 2014 | 64.36 | 147 |
| 2013 | 65.3 | 149 |
| 2012 | 66.37 | 149 |
| 2011 | 67.51 | 149 |
| 2010 | 68.67 | 149 |
| 2009 | 70.09 | 149 |
| 2008 | 71.63 | 150 |
| 2007 | 73.27 | 150 |
| 2006 | 75.02 | 153 |
| 2005 | 76.86 | 156 |
| 2004 | 78.12 | 157 |
| 2003 | 79.58 | 160 |
| 2002 | 81.18 | 160 |
| 2001 | 82.85 | 163 |
| 2000 | 84.52 | 166 |
| 1999 | 87.01 | 169 |
| 1998 | 89.25 | 176 |
| 1997 | 91.21 | 179 |
| 1996 | 92.95 | 183 |
| 1995 | 94.51 | 184 |
| 1994 | 95.66 | 185 |
| 1993 | 96.54 | 186 |
| 1992 | 97.08 | 184 |
| 1991 | 97.19 | 185 |
| 1990 | 96.86 | 186 |
| 1989 | 98.15 | 186 |
| 1988 | 99.09 | 188 |
| 1987 | 99.78 | 188 |
| 1986 | 100.36 | 189 |