| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 64.7 | 97 |
| 2015 | 62.6 | 126 |
| 2014 | 77.17 | 104 |
| 2013 | 76.17 | 116 |
| 2012 | 72 | 126 |
| 2011 | 69.59 | 131 |
| 2010 | 68.16 | 127 |
| 2009 | 63.21 | 130 |
| 2008 | 62.98 | 143 |
| 2007 | 56.84 | 151 |
| 2006 | 53.14 | 160 |
| 2005 | 51.39 | 157 |
| 2004 | 47.93 | 162 |
| 2003 | 50.77 | 154 |
| 2002 | 43.75 | 158 |
| 2001 | 47.85 | 151 |
| 2000 | 51.1 | 145 |
| 1999 | 46.62 | 143 |
| 1998 | 48.61 | 140 |
| 1997 | 61.17 | 110 |
| 1996 | 59.7 | 110 |
| 1995 | 64.33 | 105 |
| 1994 | 67.32 | 88 |
| 1993 | 57.68 | 97 |
| 1992 | 59.89 | 91 |
| 1991 | 58.22 | 90 |
| 1990 | 51.4 | 103 |
| 1989 | 54.17 | 84 |
| 1988 | 59.76 | 69 |
| 1987 | 57.75 | 68 |
| 1986 | 57.93 | 68 |