时间 | 值 (%) | 世界排名 |
---|---|---|
2012 | 0.6 | 68 |
2011 | 0.8 | 66 |
2010 | 0.8 | 67 |
2009 | 1.6 | 61 |
2008 | 2.4 | 60 |
2007 | 7.7 | 53 |
2006 | 5.3 | 51 |
2005 | 2.6 | 54 |
2004 | 1.8 | 62 |
2003 | 2.7 | 48 |
2002 | 0.7 | 62 |
2001 | 0.7 | 66 |
2000 | 0.3 | 69 |
1999 | 0.1 | 77 |
1998 | 0.1 | 79 |
1997 | 0.2 | 75 |