| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 39.45 | 95 |
| 2015 | 40.38 | 97 |
| 2014 | 41.45 | 98 |
| 2013 | 42.69 | 104 |
| 2012 | 44.07 | 105 |
| 2011 | 45.48 | 112 |
| 2010 | 46.85 | 113 |
| 2009 | 48.62 | 114 |
| 2008 | 50.47 | 116 |
| 2007 | 52.43 | 117 |
| 2006 | 54.61 | 118 |
| 2005 | 57.02 | 120 |
| 2004 | 60.12 | 121 |
| 2003 | 63.6 | 123 |
| 2002 | 67.39 | 127 |
| 2001 | 71.28 | 131 |
| 2000 | 75.03 | 140 |
| 1999 | 77.57 | 146 |
| 1998 | 79.71 | 146 |
| 1997 | 81.53 | 147 |
| 1996 | 83.28 | 150 |
| 1995 | 85.02 | 156 |
| 1994 | 84.38 | 149 |
| 1993 | 84.05 | 144 |
| 1992 | 83.78 | 140 |
| 1991 | 83.21 | 139 |
| 1990 | 82.19 | 133 |
| 1989 | 83.05 | 133 |
| 1988 | 83.3 | 135 |
| 1987 | 83.16 | 134 |
| 1986 | 82.93 | 133 |