| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 53 | 132 |
| 2015 | 54.02 | 133 |
| 2014 | 54.98 | 133 |
| 2013 | 56.15 | 131 |
| 2012 | 57.5 | 131 |
| 2011 | 58.96 | 132 |
| 2010 | 60.46 | 135 |
| 2009 | 62.43 | 136 |
| 2008 | 64.59 | 138 |
| 2007 | 66.91 | 138 |
| 2006 | 69.34 | 147 |
| 2005 | 71.82 | 148 |
| 2004 | 74.11 | 149 |
| 2003 | 76.22 | 151 |
| 2002 | 78.13 | 152 |
| 2001 | 79.94 | 154 |
| 2000 | 81.75 | 158 |
| 1999 | 83.12 | 159 |
| 1998 | 84.27 | 159 |
| 1997 | 85.14 | 158 |
| 1996 | 85.59 | 161 |
| 1995 | 85.52 | 160 |
| 1994 | 85.89 | 157 |
| 1993 | 85.94 | 155 |
| 1992 | 85.73 | 152 |
| 1991 | 85.34 | 148 |
| 1990 | 84.79 | 145 |
| 1989 | 85.05 | 142 |
| 1988 | 85.28 | 141 |
| 1987 | 85.48 | 139 |
| 1986 | 85.59 | 140 |