| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 105.4 | 4 |
| 2015 | 113.8 | 6 |
| 2014 | 110.7 | 6 |
| 2013 | 133.9 | 4 |
| 2012 | 96.2 | 7 |
| 2011 | 129.6 | 8 |
| 2010 | 111.6 | 8 |
| 2009 | 117 | 7 |
| 2008 | 199.3 | 7 |
| 2007 | 152.1 | 6 |
| 2006 | 119.2 | 5 |
| 2005 | 94.9 | 11 |
| 2004 | 97.2 | 12 |
| 2003 | 78.8 | 12 |
| 2002 | 83.7 | 12 |
| 2001 | 75.2 | 18 |
| 2000 | 78.6 | 15 |
| 1999 | 45.5 | 22 |
| 1998 | 42.9 | 29 |
| 1997 | 50 | 23 |
| 1996 | 39.4 | 20 |
| 1995 | 32.3 | 22 |
| 1994 | 29.8 | 22 |
| 1993 | 31.3 | 18 |
| 1992 | 26.9 | 17 |
| 1991 | 34.3 | 10 |
| 1990 | 52.6 | 10 |
| 1989 | 61.2 | 6 |
| 1988 | 67.1 | 6 |
| 1987 | 73.9 | 8 |
| 1986 | 64.8 | 5 |