| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 98.18 | 19 |
| 2015 | 77.99 | 46 |
| 2014 | 75.44 | 40 |
| 2013 | 74.61 | 36 |
| 2012 | 69.72 | 42 |
| 2011 | 75.79 | 36 |
| 2010 | 80.75 | 31 |
| 2009 | 83.16 | 30 |
| 2008 | 88.4 | 28 |
| 2007 | 96.21 | 22 |
| 2006 | 97.39 | 19 |
| 2005 | 97.14 | 22 |
| 2004 | 96.68 | 23 |
| 2003 | 96.68 | 19 |
| 2002 | 87.84 | 24 |
| 2001 | 82.38 | 25 |
| 2000 | 76.74 | 24 |
| 1999 | 76.04 | 25 |
| 1998 | 77.03 | 20 |
| 1997 | 75.15 | 20 |
| 1996 | 78.64 | 15 |
| 1995 | 79.79 | 14 |
| 1994 | 84.63 | 11 |
| 1993 | 85.81 | 12 |
| 1992 | 84.54 | 13 |
| 1991 | 88.51 | 11 |
| 1990 | 85.82 | 9 |
| 1989 | 83.46 | 12 |
| 1988 | 88.39 | 11 |
| 1987 | 87.03 | 9 |
| 1986 | 96.73 | 8 |