| 年度 | 实际值 |
|---|---|
| 1995 | 42.6 |
| 1996 | 48.4 |
| 1997 | 53.35 |
| 1998 | 50.3 |
| 1999 | 49.9 |
| 2000 | 45 |
| 2001 | 41.91 |
| 2002 | 43.11 |
| 2003 | 45.68 |
| 2004 | 49.75 |
| 2005 | 50.01 |
| 2006 | 52.51 |
| 2007 | |
| 2008 | 57.91 |
| 2009 | |
| 2010 | 53.76 |
| 2011 | 54.83 |
| 2012 | 56.2 |
| 2013 | 55.44 |
| 2014 | 42.11 |
| 2015 | 48.27 |
| 2016 | 50.67 |
| 2017 | 49.51 |
| 2018 | 50.39 |