| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 74.68 | 88 |
| 2015 | 74.63 | 90 |
| 2014 | 74.52 | 90 |
| 2013 | 74.54 | 91 |
| 2012 | 74.94 | 89 |
| 2011 | 75.25 | 89 |
| 2010 | 74.72 | 92 |
| 2009 | 73.72 | 100 |
| 2008 | 74.33 | 95 |
| 2007 | 73.79 | 99 |
| 2006 | 73.67 | 99 |
| 2005 | 73.14 | 104 |
| 2004 | 72.96 | 108 |
| 2003 | 73.12 | 106 |
| 2002 | 73.43 | 106 |
| 2001 | 74.05 | 99 |
| 2000 | 74.64 | 95 |
| 1999 | 75.7 | 91 |
| 1998 | 75.94 | 92 |
| 1997 | 75.89 | 93 |
| 1996 | 76.2 | 90 |
| 1995 | 76.87 | 90 |
| 1994 | 77.79 | 84 |
| 1993 | 77.94 | 86 |
| 1992 | 77.06 | 92 |
| 1991 | 76.74 | 94 |
| 1990 | 76.73 | 97 |