| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 56.53 | 83 |
| 2015 | 58.63 | 87 |
| 2014 | 61.03 | 93 |
| 2013 | 60.68 | 94 |
| 2012 | 57.22 | 109 |
| 2011 | 56.01 | 114 |
| 2010 | 50.14 | 124 |
| 2009 | 45.86 | 133 |
| 2008 | 63.61 | 105 |
| 2007 | 52.85 | 128 |
| 2006 | 50.39 | 137 |
| 2005 | 44.2 | 146 |
| 2004 | 43.58 | 145 |
| 2003 | 43.5 | 135 |
| 2002 | 51.08 | 105 |
| 2001 | 47.32 | 119 |
| 2000 | 43.76 | 128 |
| 1999 | 39.09 | 134 |
| 1998 | 40.36 | 135 |
| 1997 | 41.96 | 127 |
| 1996 | 40.24 | 129 |
| 1995 | 37.57 | 140 |
| 1994 | 34.83 | 137 |
| 1993 | 32.92 | 123 |
| 1992 | 32.09 | 125 |
| 1991 | 33.97 | 112 |
| 1990 | 36.3 | 110 |
| 1989 | 31.57 | 120 |
| 1988 | 34.31 | 107 |
| 1987 | 33.98 | 103 |
| 1986 | 38.21 | 96 |