年度 | 实际值 |
---|---|
1992 | 21.9 |
1993 | |
1994 | |
1995 | 22.4 |
1996 | |
1997 | |
1998 | |
1999 | 23.6 |
2000 | 24.1 |
2001 | 25 |
2002 | 24.8 |
2003 | 25 |
2004 | 25 |
2005 | 25 |
2006 | 26 |
2007 | 27 |
2008 | 27 |
2009 | 28 |
2010 | 28 |
2011 | 29 |
2012 | 29 |
2013 | 29 |
2014 | 30 |
2015 | 30 |
2016 | 30 |
2017 | 30 |