| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 75.6 | 20 |
| 2015 | 75.61 | 20 |
| 2014 | 75.73 | 20 |
| 2013 | 75.73 | 20 |
| 2012 | 76.29 | 17 |
| 2011 | 76.55 | 15 |
| 2010 | 76.81 | 15 |
| 2009 | 77.05 | 14 |
| 2008 | 77.26 | 14 |
| 2007 | 76.37 | 16 |
| 2006 | 76.93 | 14 |
| 2005 | 75.79 | 17 |
| 2004 | 75.23 | 18 |
| 2003 | 74.63 | 17 |
| 2002 | 74.01 | 17 |
| 2001 | 73.36 | 19 |
| 2000 | 72.71 | 21 |
| 1999 | 72.05 | 23 |
| 1998 | 71.75 | 24 |
| 1997 | 71.71 | 25 |
| 1996 | 71.71 | 25 |
| 1995 | 71.7 | 24 |
| 1994 | 72.01 | 23 |
| 1993 | 71.86 | 23 |
| 1992 | 72.11 | 22 |
| 1991 | 72 | 23 |