| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 105.9 | 7 |
| 2015 | 127.1 | 6 |
| 2014 | 99.9 | 5 |
| 2013 | 118 | 3 |
| 2012 | 53.9 | 14 |
| 2011 | 70 | 11 |
| 2010 | 74.9 | 11 |
| 2009 | 73.9 | 13 |
| 2008 | 123.2 | 6 |
| 2007 | 145.9 | 11 |
| 2006 | 121.4 | 8 |
| 2005 | 91.2 | 9 |
| 2004 | 71.8 | 13 |
| 2003 | 52.4 | 17 |
| 2002 | 42.1 | 16 |
| 2001 | 39.5 | 17 |
| 2000 | 50.8 | 23 |
| 1999 | 44.5 | 20 |
| 1998 | 25.9 | 24 |
| 1997 | 23.6 | 23 |
| 1996 | 24.6 | 15 |
| 1995 | 21 | 16 |
| 1994 | 21.8 | 14 |
| 1993 | 20.4 | 15 |
| 1992 | 15.6 | 11 |
| 1991 | 28.8 | 5 |
| 1990 | 49.1 | 3 |
| 1989 | 85.5 | 2 |
| 1988 | 83.4 | 2 |
| 1987 | 80.1 | 3 |
| 1986 | 55.7 | 2 |