| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 84.2 | 31 |
| 2015 | 80.9 | 39 |
| 2014 | 73.81 | 42 |
| 2013 | 70.94 | 44 |
| 2012 | 78.62 | 30 |
| 2011 | 80.83 | 30 |
| 2010 | 83.25 | 28 |
| 2009 | 92.36 | 25 |
| 2008 | 97.18 | 22 |
| 2007 | 97.95 | 21 |
| 2006 | 93.7 | 22 |
| 2005 | 98.63 | 19 |
| 2004 | 93.49 | 24 |
| 2003 | 90.32 | 23 |
| 2002 | 95.77 | 18 |
| 2001 | 94.94 | 16 |
| 2000 | 90.1 | 15 |
| 1999 | 92.41 | 13 |
| 1998 | 105.24 | 11 |
| 1997 | 105.43 | 8 |
| 1996 | 114.52 | 7 |
| 1995 | 108.67 | 7 |
| 1994 | 98.55 | 8 |
| 1993 | 106.92 | 8 |
| 1992 | 104.48 | 6 |
| 1991 | 115.46 | 7 |
| 1990 | 131.8 | 3 |
| 1989 | 137.99 | 3 |
| 1988 | 101.21 | 9 |
| 1987 | 103.83 | 7 |
| 1986 | 125.26 | 3 |