年度 | 实际值 |
---|---|
1995 | 20.5 |
1996 | 22.1 |
1997 | 21.48 |
1998 | 21.7 |
1999 | 21.4 |
2000 | 20.7 |
2001 | 19.32 |
2002 | 19.35 |
2003 | 20.21 |
2004 | 21.04 |
2005 | 16.18 |
2006 | 14.47 |
2007 | 13.92 |
2008 | 11.8 |
2009 | |
2010 | 10.17 |
2011 | 9.12 |
2012 | 8.33 |
2013 | 8.78 |
2014 | 8.87 |
2015 | 9.33 |
2016 | 8.42 |
2017 | |
2018 | 8.03 |