年度 | 实际值 |
---|---|
1992 | 27.2 |
1993 | |
1994 | |
1995 | 27.5 |
1996 | |
1997 | |
1998 | |
1999 | 27.8 |
2000 | 28 |
2001 | 28 |
2002 | 27.9 |
2003 | 28 |
2004 | 28 |
2005 | 27.5 |
2006 | 27.9 |
2007 | 28.4504 |
2008 | 28.89 |
2009 | 29.3 |
2010 | 29.8953 |
2011 | 30.15 |
2012 | 30.2229 |
2013 | 30.45 |
2014 | 30.79 |
2015 | 31.36 |
2016 | 31.1707 |
2017 | 31 |