| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 66.19 | 91 |
| 2015 | 65.53 | 93 |
| 2014 | 64.84 | 92 |
| 2013 | 64.13 | 92 |
| 2012 | 63.39 | 93 |
| 2011 | 62.62 | 96 |
| 2010 | 61.83 | 98 |
| 2009 | 61.02 | 98 |
| 2008 | 60.19 | 99 |
| 2007 | 59.36 | 100 |
| 2006 | 58.53 | 100 |
| 2005 | 57.69 | 100 |
| 2004 | 56.85 | 103 |
| 2003 | 56 | 105 |
| 2002 | 55.15 | 108 |
| 2001 | 54.29 | 108 |
| 2000 | 53.44 | 107 |
| 1999 | 52.51 | 111 |
| 1998 | 51.57 | 112 |
| 1997 | 50.64 | 117 |
| 1996 | 49.7 | 117 |
| 1995 | 48.77 | 118 |
| 1994 | 47.83 | 121 |
| 1993 | 46.9 | 122 |
| 1992 | 45.97 | 123 |
| 1991 | 45.04 | 123 |
| 1990 | 44.12 | 123 |
| 1989 | 41.5 | 124 |
| 1988 | 38.9 | 131 |
| 1987 | 36.36 | 137 |
| 1986 | 33.89 | 143 |