| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 43.9 | 112 |
| 2015 | 42.74 | 106 |
| 2014 | 41.83 | 100 |
| 2013 | 40.89 | 97 |
| 2012 | 40.04 | 93 |
| 2011 | 39.37 | 90 |
| 2010 | 38.93 | 87 |
| 2009 | 39.03 | 87 |
| 2008 | 39.41 | 85 |
| 2007 | 40.13 | 85 |
| 2006 | 41.29 | 84 |
| 2005 | 42.96 | 85 |
| 2004 | 45.1 | 90 |
| 2003 | 47.79 | 93 |
| 2002 | 50.83 | 97 |
| 2001 | 53.82 | 102 |
| 2000 | 56.51 | 103 |
| 1999 | 59 | 107 |
| 1998 | 61.07 | 108 |
| 1997 | 62.85 | 108 |
| 1996 | 64.75 | 108 |
| 1995 | 67.08 | 110 |
| 1994 | 68.5 | 109 |
| 1993 | 69.99 | 109 |
| 1992 | 71.44 | 111 |
| 1991 | 72.54 | 112 |
| 1990 | 73.03 | 114 |
| 1989 | 74.6 | 116 |
| 1988 | 75.92 | 118 |
| 1987 | 77.01 | 119 |
| 1986 | 77.95 | 122 |