年度 | 实际值 |
---|---|
1993 | 16 |
1994 | 18 |
1995 | 18 |
1996 | 18 |
1997 | 18 |
1998 | |
1999 | 18 |
2000 | 18 |
2001 | 18 |
2002 | 18 |
2003 | 19 |
2004 | 19 |
2005 | 20 |
2006 | 24 |
2007 | 24 |
2008 | 25 |
2009 | |
2010 | 26 |
2011 | 29 |
2012 | 33 |
2013 | 34 |
2014 | 36 |
2015 | 37 |
2016 | 39 |
2017 | 39 |
2018 | 40 |