| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.45 | 35 |
| 2015 | 88.5 | 33 |
| 2014 | 86 | 43 |
| 2013 | 105.16 | 30 |
| 2012 | 95.54 | 37 |
| 2011 | 89.62 | 50 |
| 2010 | 83.8 | 48 |
| 2009 | 76.24 | 49 |
| 2008 | 74.67 | 76 |
| 2007 | 75.85 | 68 |
| 2006 | 77.85 | 64 |
| 2005 | 81.33 | 54 |
| 2004 | 76.46 | 58 |
| 2003 | 82.03 | 44 |
| 2002 | 69.03 | 66 |
| 2001 | 68.3 | 66 |
| 2000 | 71.47 | 62 |
| 1999 | 62.69 | 71 |
| 1998 | 63.5 | 67 |
| 1997 | 71.32 | 56 |
| 1996 | 75.4 | 45 |
| 1995 | 74.23 | 45 |
| 1994 | 55.97 | 75 |
| 1993 | 25.54 | 140 |
| 1992 | 39.52 | 105 |
| 1991 | 43.44 | 89 |
| 1990 | 52.14 | 73 |
| 1989 | 53 | 64 |
| 1988 | 52.87 | 63 |
| 1987 | 53.48 | 60 |
| 1986 | 48.64 | 71 |