| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 69.07 | 56 |
| 2015 | 70.7 | 60 |
| 2014 | 69.64 | 71 |
| 2013 | 69.99 | 77 |
| 2012 | 72.12 | 77 |
| 2011 | 72.62 | 73 |
| 2010 | 67.71 | 74 |
| 2009 | 59.87 | 81 |
| 2008 | 70.12 | 85 |
| 2007 | 69.08 | 81 |
| 2006 | 67.1 | 84 |
| 2005 | 61.09 | 92 |
| 2004 | 57.66 | 106 |
| 2003 | 54.12 | 100 |
| 2002 | 53.2 | 102 |
| 2001 | 54.23 | 96 |
| 2000 | 53.8 | 102 |
| 1999 | 46.25 | 114 |
| 1998 | 45.26 | 112 |
| 1997 | 43.21 | 123 |
| 1996 | 39.29 | 132 |
| 1995 | 38.1 | 137 |
| 1994 | 36.64 | 132 |
| 1993 | 34.94 | 115 |
| 1992 | 39.5 | 106 |
| 1991 | 42.58 | 90 |
| 1990 | 44.01 | 90 |
| 1989 | 43.84 | 89 |
| 1988 | 41.1 | 91 |
| 1987 | 40.43 | 88 |
| 1986 | 41.66 | 85 |