| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2010 | 92.66 | 24 |
| 2009 | 89.55 | 29 |
| 2008 | 92.32 | 25 |
| 2007 | 84.91 | 29 |
| 2006 | 82.93 | 30 |
| 2005 | 78.73 | 29 |
| 2004 | 75.81 | 32 |
| 2003 | 78.32 | 29 |
| 2002 | 76.46 | 31 |
| 2001 | 80.11 | 28 |
| 2000 | 78.88 | 21 |
| 1999 | 82.25 | 18 |
| 1998 | 81.37 | 16 |
| 1997 | 82.69 | 14 |
| 1996 | 80.4 | 14 |
| 1995 | 74.01 | 19 |
| 1994 | 71.86 | 20 |
| 1993 | 70.55 | 23 |
| 1992 | 71.74 | 19 |
| 1991 | 71.17 | 18 |
| 1990 | 69.89 | 18 |
| 1989 | 65.04 | 25 |
| 1988 | 62.9 | 26 |
| 1987 | 32.37 | 65 |
| 1986 | 30.98 | 68 |