| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 68.36 | 50 |
| 2015 | 64.19 | 59 |
| 2014 | 61.58 | 61 |
| 2013 | 59.08 | 58 |
| 2012 | 56.55 | 61 |
| 2011 | 56.26 | 62 |
| 2010 | 54.22 | 67 |
| 2009 | 52.49 | 75 |
| 2008 | 51.8 | 71 |
| 2007 | 47.29 | 83 |
| 2006 | 46.3 | 78 |
| 2005 | 43.12 | 84 |
| 2004 | 39.79 | 85 |
| 2003 | 42.29 | 81 |
| 2002 | 41.88 | 80 |
| 2001 | 44.41 | 71 |
| 2000 | 40.46 | 69 |
| 1999 | 40.24 | 70 |
| 1998 | 37.38 | 75 |
| 1997 | 34.69 | 77 |
| 1996 | 32.52 | 83 |
| 1995 | 31.01 | 82 |
| 1994 | 31.29 | 83 |
| 1993 | 32.75 | 79 |
| 1992 | 32.64 | 75 |
| 1991 | 29.79 | 80 |
| 1990 | 31.19 | 70 |