| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 86.85 | 11 |
| 2015 | 86.72 | 12 |
| 2014 | 86.6 | 12 |
| 2013 | 86.8 | 12 |
| 2012 | 87.19 | 11 |
| 2011 | 88.78 | 9 |
| 2010 | 88.6 | 10 |
| 2009 | 87.32 | 12 |
| 2008 | 87.02 | 14 |
| 2007 | 87.65 | 14 |
| 2006 | 87.14 | 14 |
| 2005 | 86.56 | 14 |
| 2004 | 86.03 | 14 |
| 2003 | 85.93 | 15 |
| 2002 | 85.51 | 17 |
| 2001 | 84.96 | 18 |
| 2000 | 84.33 | 22 |
| 1999 | 82.32 | 40 |
| 1998 | 83.16 | 35 |
| 1997 | 83.81 | 29 |
| 1996 | 84.18 | 29 |
| 1995 | 84.6 | 28 |
| 1994 | 84.81 | 27 |
| 1993 | 84.72 | 28 |
| 1992 | 84.25 | 36 |
| 1991 | 83.88 | 40 |
| 1990 | 83.7 | 42 |