年度 | 实际值 |
---|---|
1995 | 21.4 |
1996 | 22.1 |
1997 | 20.51 |
1998 | 18.9 |
1999 | 17.6 |
2000 | 17.3 |
2001 | 15.99 |
2002 | 14.92 |
2003 | 13.22 |
2004 | 14.44 |
2005 | 13.45 |
2006 | 12.48 |
2007 | 12.86 |
2008 | 12.05 |
2009 | |
2010 | 9.71 |
2011 | 8.52 |
2012 | 8.21 |
2013 | 8.01 |
2014 | 7.72 |
2015 | 7.69 |
2016 | 7.92 |
2017 | |
2018 | 7.05 |