| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 81.54 | 66 |
| 2015 | 92.86 | 70 |
| 2014 | 93.62 | 80 |
| 2013 | 102.74 | 67 |
| 2012 | 101.76 | 74 |
| 2011 | 111.69 | 55 |
| 2010 | 113.18 | 45 |
| 2009 | 106.91 | 46 |
| 2008 | 106.75 | 62 |
| 2007 | 83.26 | 104 |
| 2006 | 129.63 | 27 |
| 2005 | 101.82 | 58 |
| 2004 | 89.37 | 80 |
| 2003 | 70.36 | 108 |
| 2002 | 69.56 | 107 |
| 2001 | 75.83 | 91 |
| 2000 | 82.47 | 80 |
| 1999 | 81.82 | 75 |
| 1998 | 82.52 | 77 |
| 1997 | 82.02 | 78 |
| 1996 | 81.16 | 75 |
| 1995 | 80.4 | 69 |
| 1994 | 68.95 | 84 |
| 1993 | 75.66 | 67 |
| 1992 | 87.89 | 51 |
| 1991 | 72.28 | 63 |
| 1990 | 57.48 | 91 |
| 1989 | 66.02 | 64 |
| 1988 | 77.19 | 50 |
| 1987 | 61.64 | 63 |
| 1986 | 70.05 | 56 |