| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 68.16 | 147 |
| 2015 | 68.79 | 147 |
| 2014 | 69.62 | 146 |
| 2013 | 70.57 | 147 |
| 2012 | 71.65 | 147 |
| 2011 | 72.8 | 147 |
| 2010 | 73.96 | 147 |
| 2009 | 75.43 | 147 |
| 2008 | 77.02 | 147 |
| 2007 | 78.72 | 150 |
| 2006 | 80.51 | 153 |
| 2005 | 82.37 | 155 |
| 2004 | 83.71 | 157 |
| 2003 | 85.21 | 159 |
| 2002 | 86.83 | 160 |
| 2001 | 88.48 | 161 |
| 2000 | 90.1 | 162 |
| 1999 | 92.63 | 168 |
| 1998 | 94.88 | 173 |
| 1997 | 96.86 | 176 |
| 1996 | 98.59 | 180 |
| 1995 | 100.14 | 182 |
| 1994 | 101.28 | 183 |
| 1993 | 102.15 | 184 |
| 1992 | 102.67 | 184 |
| 1991 | 102.74 | 184 |
| 1990 | 102.36 | 185 |
| 1989 | 103.72 | 187 |
| 1988 | 104.71 | 188 |
| 1987 | 105.46 | 188 |
| 1986 | 106.08 | 188 |