年度 | 实际值 |
---|---|
1992 | 30.9 |
1993 | |
1994 | |
1995 | 31.6 |
1996 | |
1997 | |
1998 | |
1999 | 33 |
2000 | 33.3 |
2001 | 34 |
2002 | 33.9 |
2003 | 34 |
2004 | 34 |
2005 | 35 |
2006 | 35 |
2007 | 36 |
2008 | 36 |
2009 | 29 |
2010 | 29 |
2011 | 30 |
2012 | 30 |
2013 | 30 |
2014 | 30 |
2015 | 30 |
2016 | 31 |
2017 | 31 |