| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 55.94 | 114 |
| 2015 | 54.75 | 106 |
| 2014 | 53.96 | 104 |
| 2013 | 53.31 | 101 |
| 2012 | 52.82 | 98 |
| 2011 | 52.53 | 95 |
| 2010 | 52.49 | 94 |
| 2009 | 52.94 | 97 |
| 2008 | 53.73 | 98 |
| 2007 | 54.86 | 97 |
| 2006 | 56.25 | 100 |
| 2005 | 57.73 | 102 |
| 2004 | 60.01 | 105 |
| 2003 | 62.31 | 108 |
| 2002 | 64.42 | 110 |
| 2001 | 66.28 | 111 |
| 2000 | 67.92 | 112 |
| 1999 | 69.87 | 112 |
| 1998 | 71.6 | 111 |
| 1997 | 73.14 | 111 |
| 1996 | 74.47 | 113 |
| 1995 | 75.56 | 112 |
| 1994 | 75.86 | 111 |
| 1993 | 75.79 | 109 |
| 1992 | 75.38 | 106 |
| 1991 | 74.71 | 104 |
| 1990 | 73.81 | 99 |
| 1989 | 73.41 | 94 |
| 1988 | 73.02 | 94 |
| 1987 | 72.66 | 93 |
| 1986 | 72.26 | 87 |