| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 86.67 | 30 |
| 2015 | 80.94 | 45 |
| 2014 | 83.53 | 46 |
| 2013 | 99.2 | 35 |
| 2012 | 91.49 | 43 |
| 2011 | 63.63 | 98 |
| 2010 | 63.99 | 81 |
| 2009 | 60.77 | 79 |
| 2008 | 69.68 | 87 |
| 2007 | 69.81 | 79 |
| 2006 | 67.39 | 82 |
| 2005 | 63.19 | 85 |
| 2004 | 60.64 | 90 |
| 2003 | 58.26 | 85 |
| 2002 | 59.41 | 83 |
| 2001 | 59.67 | 77 |
| 2000 | 60.01 | 82 |
| 1999 | 55.25 | 89 |
| 1998 | 53.89 | 91 |
| 1997 | 53.07 | 93 |
| 1996 | 47.93 | 108 |
| 1995 | 47.34 | 108 |
| 1994 | 47.4 | 94 |
| 1993 | 47.03 | 83 |
| 1992 | 48.46 | 80 |
| 1991 | 49.14 | 69 |
| 1990 | 51.85 | 74 |
| 1989 | 54.43 | 60 |
| 1988 | 51.28 | 67 |
| 1987 | 49.83 | 69 |
| 1986 | 50.95 | 63 |