| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2014 | 78.33 | 59 |
| 2013 | 78.06 | 63 |
| 2012 | 75.74 | 67 |
| 2011 | 90.64 | 48 |
| 2010 | 99.75 | 25 |
| 2009 | 93.82 | 26 |
| 2008 | 115.29 | 24 |
| 2007 | 120.28 | 15 |
| 2006 | 116.24 | 19 |
| 2005 | 102.8 | 30 |
| 2004 | 107.76 | 22 |
| 2003 | 101.05 | 24 |
| 2002 | 92.61 | 31 |
| 2001 | 93.35 | 28 |
| 2000 | 92.21 | 33 |
| 1999 | 88.09 | 31 |
| 1998 | 79.48 | 45 |
| 1997 | 78.47 | 44 |
| 1996 | 82.82 | 34 |
| 1995 | 88.57 | 23 |
| 1994 | 75.49 | 37 |
| 1993 | 78.08 | 28 |
| 1992 | 77.94 | 27 |
| 1991 | 81.16 | 24 |
| 1990 | 73.61 | 36 |
| 1989 | 82.73 | 30 |
| 1988 | 76.37 | 29 |
| 1987 | 73.99 | 29 |
| 1986 | 79.8 | 23 |