| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 75.37 | 67 |
| 2015 | 74.71 | 67 |
| 2014 | 74.01 | 65 |
| 2013 | 73.28 | 68 |
| 2012 | 72.53 | 69 |
| 2011 | 71.74 | 69 |
| 2010 | 70.91 | 70 |
| 2009 | 70.08 | 71 |
| 2008 | 69.23 | 72 |
| 2007 | 68.36 | 73 |
| 2006 | 67.48 | 77 |
| 2005 | 66.59 | 80 |
| 2004 | 65.69 | 82 |
| 2003 | 64.78 | 81 |
| 2002 | 63.86 | 83 |
| 2001 | 62.92 | 83 |
| 2000 | 61.98 | 84 |
| 1999 | 60.74 | 88 |
| 1998 | 59.5 | 88 |
| 1997 | 58.24 | 92 |
| 1996 | 56.97 | 92 |
| 1995 | 55.69 | 98 |
| 1994 | 54.4 | 99 |
| 1993 | 53.11 | 102 |
| 1992 | 51.81 | 106 |
| 1991 | 50.58 | 108 |
| 1990 | 49.79 | 110 |
| 1989 | 49.01 | 110 |
| 1988 | 48.23 | 110 |
| 1987 | 47.45 | 112 |
| 1986 | 46.67 | 111 |