| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 40.1 | 131 |
| 2015 | 41.71 | 137 |
| 2014 | 45.87 | 136 |
| 2013 | 51.28 | 122 |
| 2012 | 58.91 | 103 |
| 2011 | 65.54 | 93 |
| 2010 | 69.63 | 70 |
| 2009 | 61.78 | 76 |
| 2008 | 116.63 | 22 |
| 2007 | 93.54 | 45 |
| 2006 | 78.99 | 60 |
| 2005 | 72.98 | 72 |
| 2004 | 70.46 | 70 |
| 2003 | 59.01 | 83 |
| 2002 | 59.33 | 84 |
| 2001 | 43.11 | 135 |
| 2000 | 56.62 | 93 |
| 1999 | 58.52 | 82 |
| 1998 | 75.16 | 50 |
| 1997 | 66.04 | 66 |
| 1996 | 60.9 | 74 |
| 1995 | 67.19 | 59 |
| 1994 | 59.86 | 65 |
| 1993 | 51.59 | 75 |
| 1992 | 54.03 | 63 |
| 1991 | 41.51 | 92 |
| 1990 | 40.68 | 97 |
| 1989 | 38.18 | 104 |
| 1988 | 37.66 | 98 |
| 1987 | 39.04 | 92 |
| 1986 | 39.15 | 90 |