| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 79.5 | 49 |
| 2015 | 79.5 | 49 |
| 2014 | 79.5 | 49 |
| 2013 | 79.6 | 48 |
| 2012 | 80.36 | 46 |
| 2011 | 79.73 | 52 |
| 2010 | 80.73 | 41 |
| 2009 | 79.89 | 50 |
| 2008 | 81.26 | 40 |
| 2007 | 81.35 | 41 |
| 2006 | 81.7 | 35 |
| 2005 | 80.94 | 44 |
| 2004 | 81.51 | 42 |
| 2003 | 81.12 | 46 |
| 2002 | 81.73 | 43 |
| 2001 | 82.18 | 41 |
| 2000 | 82.7 | 31 |
| 1999 | 83.34 | 30 |
| 1998 | 83.99 | 27 |
| 1997 | 84.04 | 28 |
| 1996 | 83.26 | 38 |
| 1995 | 83.05 | 42 |
| 1994 | 84.36 | 31 |
| 1993 | 85.29 | 24 |
| 1992 | 84.81 | 28 |
| 1991 | 84.36 | 33 |
| 1990 | 83.75 | 41 |