年度 | 实际值 |
---|---|
1992 | 34.6 |
1993 | |
1994 | |
1995 | 30 |
1996 | |
1997 | |
1998 | |
1999 | |
2000 | 28.5 |
2001 | 28.2 |
2002 | 28.14 |
2003 | 28.06 |
2004 | 28.04 |
2005 | 27.95 |
2006 | 28.12 |
2007 | 28.25 |
2008 | 28.49 |
2009 | 28.74 |
2010 | 28.41 |
2011 | 28.53 |
2012 | 28.07 |
2013 | 27.95 |
2014 | 27.95 |
2015 | 25.78 |