| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 62.74 | 132 |
| 2015 | 62.45 | 133 |
| 2014 | 62.43 | 131 |
| 2013 | 62.73 | 131 |
| 2012 | 63.3 | 130 |
| 2011 | 63.93 | 130 |
| 2010 | 64.42 | 128 |
| 2009 | 65.65 | 128 |
| 2008 | 66.91 | 129 |
| 2007 | 68.28 | 129 |
| 2006 | 70.03 | 130 |
| 2005 | 72.35 | 130 |
| 2004 | 74.71 | 133 |
| 2003 | 77.46 | 140 |
| 2002 | 80.43 | 143 |
| 2001 | 83.24 | 146 |
| 2000 | 85.61 | 150 |
| 1999 | 87.81 | 156 |
| 1998 | 89.54 | 159 |
| 1997 | 90.81 | 158 |
| 1996 | 91.85 | 160 |
| 1995 | 92.81 | 163 |
| 1994 | 93.19 | 160 |
| 1993 | 93.24 | 156 |
| 1992 | 92.95 | 156 |
| 1991 | 92.22 | 155 |
| 1990 | 91.03 | 145 |
| 1989 | 90.65 | 138 |
| 1988 | 90.12 | 137 |
| 1987 | 89.56 | 135 |
| 1986 | 88.98 | 134 |