| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 73.99 | 18 |
| 2015 | 74.01 | 18 |
| 2014 | 74.02 | 18 |
| 2013 | 74.02 | 18 |
| 2012 | 78.71 | 9 |
| 2011 | 81.93 | 7 |
| 2010 | 83.59 | 6 |
| 2009 | 85.13 | 3 |
| 2008 | 86.54 | 1 |
| 2007 | 87.81 | 1 |
| 2006 | 88.93 | 1 |
| 2005 | 88.68 | 1 |
| 2004 | 88.34 | 1 |
| 2003 | 87.94 | 1 |
| 2002 | 87.48 | 2 |
| 2001 | 86.96 | 2 |
| 2000 | 87 | 2 |
| 1999 | 87.04 | 2 |
| 1998 | 87.08 | 2 |
| 1997 | 87.11 | 1 |
| 1996 | 87.14 | 2 |
| 1995 | 87.2 | 2 |
| 1994 | 87.21 | 2 |
| 1993 | 87.21 | 3 |
| 1992 | 87.2 | 3 |
| 1991 | 87.19 | 3 |
| 1990 | 87.19 | 3 |