| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.54 | 15 |
| 2015 | 77.02 | 13 |
| 2014 | 76.96 | 14 |
| 2013 | 77.15 | 13 |
| 2012 | 77.35 | 14 |
| 2011 | 77.44 | 14 |
| 2010 | 77.34 | 14 |
| 2009 | 76.21 | 18 |
| 2008 | 75.69 | 18 |
| 2007 | 75.61 | 18 |
| 2006 | 75.22 | 18 |
| 2005 | 75.41 | 18 |
| 2004 | 74.17 | 20 |
| 2003 | 73.63 | 20 |
| 2002 | 72.82 | 20 |
| 2001 | 72.96 | 21 |
| 2000 | 74.36 | 18 |
| 1999 | 72.95 | 20 |
| 1998 | 72.44 | 22 |
| 1997 | 72.75 | 20 |
| 1996 | 72.85 | 21 |
| 1995 | 73.99 | 19 |
| 1994 | 73.15 | 19 |
| 1993 | 71.62 | 24 |
| 1992 | 71.04 | 25 |
| 1991 | 70.66 | 25 |