| 年度 | 实际值 |
|---|---|
| 1995 | 44.9 |
| 1996 | 45.4 |
| 1997 | 56.06 |
| 1998 | 45 |
| 1999 | 44.1 |
| 2000 | 42.3 |
| 2001 | 43.45 |
| 2002 | 43.31 |
| 2003 | 49.4 |
| 2004 | 50.64 |
| 2005 | 51.21 |
| 2006 | 52.77 |
| 2007 | 53.05 |
| 2008 | 54.46 |
| 2009 | |
| 2010 | 55.13 |
| 2011 | 51 |
| 2012 | 52.02 |
| 2013 | 52.3 |
| 2014 | 52.78 |
| 2015 | 51.64 |
| 2016 | 50.66 |
| 2017 | 50.4 |
| 2018 | 51.04 |