年度 | 实际值 |
---|---|
1992 | 29.5 |
1993 | |
1994 | |
1995 | 30 |
1996 | |
1997 | |
1998 | |
1999 | 31 |
2000 | 31.24 |
2001 | 31.2 |
2002 | 31.27 |
2003 | 31.29 |
2004 | 29.9 |
2005 | 30.01 |
2006 | 30.1 |
2007 | 30.22 |
2008 | 30.18 |
2009 | 30.13 |
2010 | 28.79 |
2011 | 28.75 |
2012 | 28.72 |
2013 | 30.14 |
2014 | 29.98 |
2015 | 29.82 |
2016 | 31 |
2017 | 29 |