| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 68.91 | 83 |
| 2015 | 68.51 | 83 |
| 2014 | 68.11 | 81 |
| 2013 | 67.7 | 82 |
| 2012 | 67.28 | 83 |
| 2011 | 66.86 | 84 |
| 2010 | 66.43 | 85 |
| 2009 | 65.99 | 86 |
| 2008 | 65.55 | 88 |
| 2007 | 65.1 | 87 |
| 2006 | 64.65 | 85 |
| 2005 | 64.19 | 85 |
| 2004 | 63.73 | 86 |
| 2003 | 63.26 | 85 |
| 2002 | 62.79 | 85 |
| 2001 | 62.31 | 86 |
| 2000 | 61.83 | 85 |
| 1999 | 61.35 | 86 |
| 1998 | 60.87 | 85 |
| 1997 | 60.38 | 85 |
| 1996 | 59.89 | 85 |
| 1995 | 59.4 | 86 |
| 1994 | 58.79 | 87 |
| 1993 | 58.17 | 87 |
| 1992 | 57.55 | 87 |
| 1991 | 56.58 | 92 |
| 1990 | 55.58 | 92 |
| 1989 | 54.57 | 93 |
| 1988 | 53.56 | 94 |
| 1987 | 52.55 | 98 |
| 1986 | 51.54 | 99 |