| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 99.78 | 20 |
| 2014 | 72.64 | 44 |
| 2013 | 65.65 | 50 |
| 2012 | 60.63 | 52 |
| 2011 | 65.27 | 50 |
| 2010 | 77.49 | 37 |
| 2009 | 81.68 | 32 |
| 2008 | 55.4 | 61 |
| 2007 | 58.19 | 61 |
| 2006 | 54.02 | 61 |
| 2005 | 55.47 | 54 |
| 2004 | 66.71 | 40 |
| 2003 | 72.9 | 33 |
| 2002 | 83.23 | 27 |
| 2001 | 86.05 | 22 |
| 2000 | 70.55 | 28 |
| 1999 | 83.74 | 16 |
| 1998 | 95.57 | 13 |
| 1997 | 82.72 | 13 |
| 1996 | 77.75 | 17 |
| 1995 | 90.89 | 10 |
| 1994 | 91.37 | 10 |
| 1993 | 88.47 | 11 |
| 1992 | 103.98 | 7 |
| 1991 | 192.24 | 1 |
| 1989 | 82.14 | 13 |
| 1988 | 96.99 | 10 |
| 1987 | 84.07 | 10 |
| 1986 | 98.23 | 7 |