| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.68 | 75 |
| 2015 | 83.71 | 82 |
| 2014 | 95.3 | 76 |
| 2013 | 102.77 | 66 |
| 2012 | 109.89 | 55 |
| 2011 | 110 | 56 |
| 2010 | 95.65 | 73 |
| 2009 | 90.41 | 68 |
| 2008 | 99.93 | 76 |
| 2007 | 77.24 | 116 |
| 2006 | 73.55 | 118 |
| 2005 | 71.18 | 119 |
| 2004 | 72.76 | 116 |
| 2003 | 63.39 | 128 |
| 2002 | 60.15 | 131 |
| 2001 | 63.91 | 117 |
| 2000 | 67.95 | 110 |
| 1999 | 61.44 | 111 |
| 1998 | 69.99 | 99 |
| 1997 | 58.63 | 116 |
| 1996 | 53.5 | 123 |
| 1995 | 52.79 | 127 |
| 1994 | 48.88 | 128 |
| 1993 | 47.59 | 122 |
| 1992 | 49.49 | 116 |
| 1991 | 50.39 | 106 |
| 1990 | 51.26 | 104 |
| 1989 | 53.55 | 85 |
| 1988 | 59.39 | 71 |
| 1987 | 63.23 | 58 |
| 1986 | 60.74 | 63 |