| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 54.08 | 103 |
| 2015 | 55.37 | 109 |
| 2014 | 56.89 | 117 |
| 2013 | 58.7 | 122 |
| 2012 | 60.75 | 127 |
| 2011 | 62.93 | 128 |
| 2010 | 65.12 | 129 |
| 2009 | 67.46 | 131 |
| 2008 | 69.92 | 134 |
| 2007 | 72.5 | 137 |
| 2006 | 75.2 | 141 |
| 2005 | 78.03 | 142 |
| 2004 | 81.1 | 149 |
| 2003 | 84.17 | 156 |
| 2002 | 87.18 | 162 |
| 2001 | 90.03 | 165 |
| 2000 | 92.72 | 173 |
| 1999 | 94.75 | 176 |
| 1998 | 96.44 | 176 |
| 1997 | 97.81 | 180 |
| 1996 | 98.91 | 181 |
| 1995 | 99.78 | 181 |
| 1994 | 100.63 | 180 |
| 1993 | 101.14 | 181 |
| 1992 | 101.39 | 180 |
| 1991 | 101.44 | 180 |
| 1990 | 101.37 | 181 |
| 1989 | 100.66 | 178 |
| 1988 | 100.1 | 178 |
| 1987 | 99.66 | 176 |
| 1986 | 99.35 | 173 |