| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 64.9 | 96 |
| 2015 | 62.69 | 125 |
| 2014 | 61.47 | 137 |
| 2013 | 60.25 | 143 |
| 2012 | 64.9 | 135 |
| 2011 | 67.7 | 135 |
| 2010 | 71.42 | 119 |
| 2009 | 65.59 | 126 |
| 2008 | 76.28 | 123 |
| 2007 | 86.62 | 95 |
| 2006 | 94.94 | 74 |
| 2005 | 97.88 | 65 |
| 2004 | 102.64 | 54 |
| 2003 | 101.85 | 55 |
| 2002 | 102.44 | 49 |
| 2001 | 98.91 | 53 |
| 2000 | 104.73 | 48 |
| 1999 | 94.91 | 52 |
| 1998 | 98.66 | 45 |
| 1997 | 108.25 | 39 |
| 1996 | 89.8 | 59 |
| 1995 | 80.54 | 68 |
| 1994 | 73.96 | 73 |
| 1993 | 71.17 | 71 |
| 1992 | 63.16 | 86 |
| 1991 | 62.18 | 82 |
| 1990 | 60.8 | 84 |
| 1989 | 58.38 | 78 |
| 1988 | 55.33 | 76 |
| 1987 | 52.86 | 77 |
| 1986 | 48.7 | 88 |