| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 56.57 | 106 |
| 2015 | 54.4 | 118 |
| 2014 | 53.44 | 124 |
| 2013 | 53.2 | 122 |
| 2012 | 55.91 | 104 |
| 2011 | 58.62 | 87 |
| 2010 | 60.33 | 69 |
| 2009 | 60.5 | 70 |
| 2008 | 61.51 | 66 |
| 2007 | 61.45 | 66 |
| 2006 | 60.75 | 66 |
| 2005 | 60.03 | 66 |
| 2004 | 60.9 | 60 |
| 2003 | 60.6 | 61 |
| 2002 | 60.06 | 65 |
| 2001 | 59.61 | 71 |
| 2000 | 57.78 | 83 |
| 1999 | 53.08 | 118 |
| 1998 | 54.18 | 108 |
| 1997 | 52.88 | 119 |
| 1996 | 48.2 | 147 |
| 1995 | 50.93 | 130 |
| 1994 | 53.47 | 118 |
| 1993 | 51.99 | 127 |
| 1992 | 47.36 | 151 |
| 1991 | 51.99 | 127 |