年度 | 实际值 |
---|---|
1992 | 25.1 |
1993 | 25.5 |
1994 | 25.89 |
1995 | 26.1 |
1996 | 26.64 |
1997 | |
1998 | |
1999 | 27.2 |
2000 | 27.9 |
2001 | 28 |
2002 | 28.5 |
2003 | 29 |
2004 | 29 |
2005 | 30 |
2006 | 30 |
2007 | 30 |
2008 | 30 |
2009 | 31 |
2010 | 31 |
2011 | 31 |
2012 | 30 |
2013 | 31 |
2014 | 31 |
2015 | 30.8 |
2016 | 31 |
2017 | 31 |
2018 | 30.8888 |