| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 54.98 | 86 |
| 2015 | 60.3 | 81 |
| 2014 | 60.44 | 95 |
| 2013 | 62.21 | 90 |
| 2012 | 63.13 | 93 |
| 2011 | 58.81 | 108 |
| 2010 | 53.67 | 113 |
| 2009 | 52.54 | 108 |
| 2008 | 64.77 | 100 |
| 2007 | 58 | 117 |
| 2006 | 56.26 | 117 |
| 2005 | 58.3 | 106 |
| 2004 | 54.14 | 113 |
| 2003 | 53.18 | 102 |
| 2002 | 56.71 | 94 |
| 2001 | 56.03 | 93 |
| 2000 | 52.12 | 106 |
| 1999 | 50.37 | 102 |
| 1998 | 48.17 | 105 |
| 1997 | 47.94 | 113 |
| 1996 | 47.85 | 109 |
| 1995 | 49.3 | 104 |
| 1994 | 46.76 | 96 |
| 1993 | 31.59 | 126 |
| 1992 | 28.43 | 132 |
| 1991 | 33.36 | 113 |
| 1990 | 34.64 | 114 |
| 1989 | 38.96 | 101 |
| 1988 | 33.52 | 110 |
| 1987 | 32.34 | 110 |
| 1986 | 37.85 | 97 |