| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 95.46 | 15 |
| 2015 | 95.34 | 14 |
| 2014 | 95.2 | 12 |
| 2013 | 95.06 | 12 |
| 2012 | 94.92 | 12 |
| 2011 | 94.76 | 12 |
| 2010 | 94.59 | 12 |
| 2009 | 94.42 | 12 |
| 2008 | 94.24 | 12 |
| 2007 | 94.05 | 12 |
| 2006 | 93.86 | 14 |
| 2005 | 93.66 | 13 |
| 2004 | 93.46 | 14 |
| 2003 | 93.25 | 14 |
| 2002 | 93.04 | 14 |
| 2001 | 92.81 | 14 |
| 2000 | 92.59 | 14 |
| 1999 | 92.23 | 16 |
| 1998 | 91.81 | 16 |
| 1997 | 91.37 | 17 |
| 1996 | 90.92 | 18 |
| 1995 | 90.44 | 19 |
| 1994 | 89.93 | 19 |
| 1993 | 89.41 | 19 |
| 1992 | 88.86 | 19 |
| 1991 | 88.29 | 20 |
| 1990 | 87.69 | 20 |
| 1989 | 87.06 | 20 |
| 1988 | 86.41 | 20 |
| 1987 | 85.73 | 21 |
| 1986 | 85.02 | 22 |