| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | 95.49 | 1 |
| 2012 | 93.11 | 1 |
| 2011 | 95.37 | 1 |
| 2010 | 96.74 | 1 |
| 2009 | 93.12 | 2 |
| 2008 | 88.26 | 1 |
| 2007 | 86.62 | 2 |
| 2006 | 86.57 | 2 |
| 2005 | 87.13 | 2 |
| 2004 | 87.96 | 2 |
| 2003 | 88.7 | 2 |
| 2002 | 89.41 | 2 |
| 2001 | 86.61 | 2 |
| 2000 | 81.55 | 2 |
| 1999 | 83.85 | 1 |
| 1998 | 88.59 | 1 |
| 1997 | 83.82 | 1 |
| 1996 | 85.29 | 1 |
| 1995 | 87.52 | 1 |
| 1994 | 88.28 | 1 |
| 1993 | 87.64 | 1 |
| 1992 | 85.97 | 1 |
| 1991 | 82.41 | 1 |
| 1990 | 83.25 | 1 |
| 1989 | 82.72 | 1 |
| 1988 | 84.43 | 1 |
| 1987 | 83.7 | 1 |
| 1986 | 81.99 | 1 |