| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 61.63 | 130 |
| 2015 | 62.39 | 132 |
| 2014 | 63.28 | 135 |
| 2013 | 64.41 | 135 |
| 2012 | 65.74 | 135 |
| 2011 | 67.2 | 135 |
| 2010 | 68.76 | 139 |
| 2009 | 69.92 | 138 |
| 2008 | 71.12 | 138 |
| 2007 | 72.34 | 136 |
| 2006 | 73.59 | 137 |
| 2005 | 74.84 | 137 |
| 2004 | 75.87 | 137 |
| 2003 | 76.82 | 136 |
| 2002 | 77.68 | 136 |
| 2001 | 78.35 | 134 |
| 2000 | 78.7 | 130 |
| 1999 | 81.21 | 132 |
| 1998 | 83.58 | 141 |
| 1997 | 85.63 | 142 |
| 1996 | 87.33 | 146 |
| 1995 | 88.93 | 146 |
| 1994 | 90.2 | 148 |
| 1993 | 90.89 | 147 |
| 1992 | 91 | 145 |
| 1991 | 90.95 | 143 |
| 1990 | 91.14 | 146 |
| 1989 | 91.98 | 146 |
| 1988 | 93.22 | 151 |
| 1987 | 94.69 | 153 |
| 1986 | 95.92 | 156 |