| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 59.54 | 127 |
| 2015 | 61.37 | 129 |
| 2014 | 63.19 | 133 |
| 2013 | 65.32 | 136 |
| 2012 | 67.65 | 138 |
| 2011 | 69.98 | 140 |
| 2010 | 72.18 | 144 |
| 2009 | 73.53 | 145 |
| 2008 | 74.74 | 145 |
| 2007 | 75.9 | 145 |
| 2006 | 77.12 | 145 |
| 2005 | 78.44 | 145 |
| 2004 | 79.05 | 142 |
| 2003 | 79.6 | 142 |
| 2002 | 80.11 | 141 |
| 2001 | 80.58 | 140 |
| 2000 | 81.02 | 138 |
| 1999 | 81.56 | 134 |
| 1998 | 81.93 | 132 |
| 1997 | 82.19 | 130 |
| 1996 | 82.37 | 128 |
| 1995 | 82.49 | 128 |
| 1994 | 83.3 | 127 |
| 1993 | 84.01 | 127 |
| 1992 | 84.57 | 125 |
| 1991 | 84.93 | 124 |
| 1990 | 85.04 | 124 |
| 1989 | 84.97 | 123 |
| 1988 | 84.73 | 121 |
| 1987 | 84.33 | 120 |
| 1986 | 83.77 | 117 |