| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.8 | 45 |
| 2015 | 4.5 | 50 |
| 2014 | -1.2 | 136 |
| 2013 | 7.6 | 28 |
| 2012 | -1.4 | 134 |
| 2011 | 1.9 | 87 |
| 2010 | 3.9 | 57 |
| 2009 | -1.22 | 140 |
| 2008 | -1.86 | 145 |
| 2007 | 5.22 | 65 |
| 2006 | 14.03 | 12 |
| 2005 | 19.05 | 5 |
| 2004 | 10.98 | 15 |
| 2003 | 14.11 | 11 |
| 2002 | 2.19 | 94 |
| 2001 | 4.27 | 61 |
| 2000 | 2.8 | 70 |
| 1999 | 1.3 | 95 |
| 1998 | -2.2 | 111 |
| 1997 | -2.35 | 115 |
| 1996 | -2.33 | 111 |
| 1995 | 0.3 | 82 |
| 1994 | -3.2 | 100 |
| 1993 | 2.2 | 63 |
| 1992 | -12.9 | 106 |
| 1991 | 7.8 | 25 |