| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 74.66 | 44 |
| 2015 | 81.4 | 43 |
| 2014 | 84.34 | 45 |
| 2013 | 92.51 | 42 |
| 2012 | 100.05 | 34 |
| 2011 | 93.77 | 41 |
| 2010 | 93.26 | 33 |
| 2009 | 95.16 | 23 |
| 2008 | 96.23 | 40 |
| 2007 | 99.28 | 36 |
| 2006 | 101.39 | 35 |
| 2005 | 101.91 | 31 |
| 2004 | 129.02 | 11 |
| 2003 | 149.27 | 7 |
| 2002 | 145.23 | 9 |
| 2001 | 174.38 | 5 |
| 2000 | 147.99 | 10 |
| 1999 | 182.57 | 6 |
| 1998 | 203.95 | 4 |
| 1997 | 193.29 | 5 |
| 1996 | 225.3 | 5 |
| 1995 | 175.17 | 5 |
| 1994 | 102.54 | 17 |
| 1993 | 98.15 | 15 |
| 1992 | 111.23 | 11 |
| 1991 | 182.68 | 5 |
| 1990 | 112.27 | 11 |
| 1989 | 103.1 | 16 |
| 1988 | 109.41 | 9 |
| 1987 | 107.13 | 12 |
| 1986 | 113.86 | 9 |