| 年度 | 实际值 |
|---|---|
| 1995 | 27.6 |
| 1996 | 26.9 |
| 1997 | 61.46 |
| 1998 | 28.7 |
| 1999 | |
| 2000 | 31.6 |
| 2001 | 27.91 |
| 2002 | 31.47 |
| 2003 | 32.11 |
| 2004 | 31.45 |
| 2005 | 31.53 |
| 2006 | 29.9 |
| 2007 | 30.75 |
| 2008 | 30.95 |
| 2009 | |
| 2010 | 32.52 |
| 2011 | 39.94 |
| 2012 | 40.91 |
| 2013 | 43.59 |
| 2014 | 44.78 |
| 2015 | 44.98 |
| 2016 | 43.57 |
| 2017 | 43.51 |
| 2018 | 45.38 |