年度 | 实际值 |
---|---|
1995 | 18.1 |
1996 | 16.9 |
1997 | 20.08 |
1998 | 8 |
1999 | 7.7 |
2000 | 7.4 |
2001 | 6.97 |
2002 | 6.45 |
2003 | 5.57 |
2004 | 6.31 |
2005 | 6.62 |
2006 | 5.97 |
2007 | 5.67 |
2008 | 5.48 |
2009 | |
2010 | 5.46 |
2011 | 4.51 |
2012 | 4.26 |
2013 | 4.15 |
2014 | 3.96 |
2015 | 4.02 |
2016 | 3.02 |
2017 | 3.06 |
2018 | 2.92 |