| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 90.33 | 25 |
| 2015 | 93.47 | 28 |
| 2014 | 101.61 | 31 |
| 2013 | 104.54 | 31 |
| 2012 | 108.85 | 28 |
| 2011 | 107.29 | 28 |
| 2010 | 91.83 | 36 |
| 2009 | 76.15 | 50 |
| 2008 | 85.47 | 58 |
| 2007 | 83.19 | 54 |
| 2006 | 78.9 | 61 |
| 2005 | 72.93 | 73 |
| 2004 | 51.21 | 118 |
| 2003 | 46.67 | 125 |
| 2002 | 44.31 | 128 |
| 2001 | 44.41 | 129 |
| 2000 | 47.97 | 118 |
| 1999 | 49.57 | 104 |
| 1998 | 44.55 | 117 |
| 1997 | 46.17 | 117 |
| 1996 | 37.6 | 138 |
| 1995 | 34.8 | 148 |
| 1994 | 31.1 | 154 |
| 1993 | 57.56 | 64 |
| 1992 | 60.13 | 54 |
| 1991 | 68.71 | 40 |
| 1990 | 95.89 | 19 |
| 1989 | 91.39 | 25 |
| 1988 | 39.45 | 93 |
| 1987 | 28.56 | 121 |
| 1986 | 38.26 | 95 |