年度 | 实际值 |
---|---|
1995 | 35.7 |
1996 | 31.7 |
1997 | 30.99 |
1998 | 26.6 |
1999 | 25 |
2000 | 24.8 |
2001 | 24.13 |
2002 | 22.52 |
2003 | 21.32 |
2004 | 20.02 |
2005 | 19.97 |
2006 | 18.33 |
2007 | 19.34 |
2008 | 17.2 |
2009 | |
2010 | 14 |
2011 | 13.15 |
2012 | 11.66 |
2013 | 11.12 |
2014 | 10.79 |
2015 | 10.99 |
2016 | 11.15 |
2017 | |
2018 | 9.38 |