| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 96.47 | 50 |
| 2015 | 92.22 | 72 |
| 2014 | 93.76 | 78 |
| 2013 | 85.97 | 90 |
| 2012 | 84.02 | 100 |
| 2011 | 90.44 | 91 |
| 2010 | 89.13 | 86 |
| 2009 | 84.33 | 88 |
| 2008 | 96.92 | 79 |
| 2007 | 91.17 | 87 |
| 2006 | 87.95 | 94 |
| 2005 | 87.9 | 89 |
| 2004 | 81.27 | 97 |
| 2003 | 78.76 | 91 |
| 2002 | 82.74 | 80 |
| 2001 | 83.64 | 73 |
| 2000 | 97.54 | 57 |
| 1999 | 126.02 | 24 |
| 1998 | 125.29 | 22 |
| 1997 | 126.13 | 21 |
| 1996 | 112.71 | 30 |
| 1995 | 114.22 | 29 |
| 1994 | 111.85 | 29 |
| 1993 | 109.58 | 28 |
| 1992 | 117.29 | 25 |
| 1991 | 121.17 | 21 |
| 1990 | 135.08 | 16 |
| 1989 | 125.55 | 19 |
| 1988 | 123.43 | 17 |
| 1987 | 114.57 | 21 |
| 1986 | 112.54 | 19 |