| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 67.8 | 145 |
| 2015 | 68.08 | 144 |
| 2014 | 68.69 | 144 |
| 2013 | 69.31 | 144 |
| 2012 | 69.99 | 143 |
| 2011 | 70.84 | 143 |
| 2010 | 71.9 | 143 |
| 2009 | 72.58 | 142 |
| 2008 | 73.41 | 143 |
| 2007 | 74.29 | 143 |
| 2006 | 75.11 | 140 |
| 2005 | 75.8 | 140 |
| 2004 | 76.57 | 140 |
| 2003 | 77.16 | 137 |
| 2002 | 77.55 | 134 |
| 2001 | 77.79 | 132 |
| 2000 | 77.95 | 128 |
| 1999 | 79.24 | 129 |
| 1998 | 80.41 | 128 |
| 1997 | 81.46 | 129 |
| 1996 | 82.4 | 129 |
| 1995 | 83.2 | 130 |
| 1994 | 84.39 | 128 |
| 1993 | 85.59 | 129 |
| 1992 | 86.79 | 128 |
| 1991 | 87.91 | 129 |
| 1990 | 88.88 | 131 |
| 1989 | 91.34 | 141 |
| 1988 | 93.87 | 153 |
| 1987 | 96.51 | 158 |
| 1986 | 99.3 | 172 |