| 年度 | 实际值 |
|---|---|
| 1995 | 54.8 |
| 1996 | 56.7 |
| 1997 | 26.67 |
| 1998 | 27.1 |
| 1999 | 26.3 |
| 2000 | 26.4 |
| 2001 | 26.06 |
| 2002 | 26.73 |
| 2003 | 30.37 |
| 2004 | 26.63 |
| 2005 | 27.05 |
| 2006 | 27.77 |
| 2007 | 28.68 |
| 2008 | 27.99 |
| 2009 | |
| 2010 | 27.29 |
| 2011 | 28.16 |
| 2012 | 30.12 |
| 2013 | 30.88 |
| 2014 | 34.6 |
| 2015 | 37.41 |
| 2016 | 39.17 |
| 2017 | |
| 2018 | 42.68 |