| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 27.49 | 67 |
| 2015 | 28.78 | 65 |
| 2014 | 28.49 | 69 |
| 2013 | 30.05 | 62 |
| 2012 | 31.18 | 57 |
| 2011 | 33.84 | 48 |
| 2010 | 37.03 | 37 |
| 2009 | 35.81 | 34 |
| 2008 | 43.55 | 21 |
| 2007 | 43.91 | 19 |
| 2006 | 44.66 | 20 |
| 2005 | 45.3 | 18 |
| 2004 | 41.12 | 21 |
| 2003 | 41.99 | 17 |
| 2002 | 38.98 | 25 |
| 2001 | 36.41 | 34 |
| 2000 | 38.98 | 25 |
| 1999 | 32.2 | 49 |
| 1998 | 30.76 | 59 |
| 1997 | 33.2 | 42 |
| 1996 | 32.59 | 48 |
| 1995 | 31.99 | 61 |
| 1994 | 36.98 | 30 |
| 1993 | 26.95 | 80 |
| 1992 | 39.4 | 27 |
| 1991 | 49.24 | 10 |
| 1990 | 51.96 | 6 |