| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 85.81 | 31 |
| 2014 | 77.71 | 37 |
| 2013 | 74.04 | 38 |
| 2012 | 73.21 | 38 |
| 2011 | 74.2 | 39 |
| 2010 | 81.38 | 30 |
| 2009 | 82.54 | 31 |
| 2008 | 69.6 | 43 |
| 2007 | 68.81 | 41 |
| 2006 | 58 | 53 |
| 2005 | 58.5 | 47 |
| 2004 | 58.24 | 49 |
| 2003 | 66.4 | 40 |
| 2002 | 71.78 | 36 |
| 2001 | 69.81 | 36 |
| 2000 | 63.29 | 35 |
| 1999 | 78.6 | 21 |
| 1998 | 80.82 | 18 |
| 1997 | 67.42 | 27 |
| 1996 | 65.05 | 30 |
| 1995 | 65.81 | 29 |
| 1994 | 64.37 | 24 |
| 1993 | 65.02 | 26 |
| 1992 | 67.31 | 26 |
| 1991 | 66.07 | 23 |
| 1990 | 58.52 | 30 |
| 1989 | 72.45 | 19 |
| 1988 | 72.38 | 20 |
| 1987 | 75.93 | 14 |
| 1986 | 77.13 | 11 |