| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 72.77 | 43 |
| 2015 | 73.47 | 48 |
| 2014 | 70.83 | 46 |
| 2013 | 71.02 | 43 |
| 2012 | 72.94 | 40 |
| 2011 | 74.64 | 38 |
| 2010 | 75.8 | 39 |
| 2009 | 77.68 | 39 |
| 2008 | 80.8 | 31 |
| 2007 | 79.09 | 34 |
| 2006 | 73.19 | 38 |
| 2005 | 66.97 | 41 |
| 2004 | 61.6 | 44 |
| 2003 | 60.63 | 46 |
| 2002 | 58.26 | 49 |
| 2001 | 57.31 | 46 |
| 2000 | 52.71 | 46 |
| 1999 | 55.73 | 42 |
| 1998 | 55.08 | 45 |
| 1997 | 52.49 | 45 |
| 1996 | 49.37 | 51 |
| 1995 | 48.62 | 48 |
| 1994 | 47.61 | 48 |
| 1993 | 45.5 | 56 |
| 1992 | 48.95 | 45 |
| 1991 | 53.36 | 36 |
| 1990 | 52.16 | 38 |
| 1989 | 53.67 | 36 |
| 1988 | 53.44 | 36 |
| 1987 | 50.48 | 34 |
| 1986 | 49.36 | 32 |