| 年度 | 实际值 |
|---|---|
| 1995 | 52.4 |
| 1996 | 45.7 |
| 1997 | 47.15 |
| 1998 | 48.2 |
| 1999 | 48.8 |
| 2000 | 48.5 |
| 2001 | 48.29 |
| 2002 | 48.63 |
| 2003 | 47.23 |
| 2004 | 45.34 |
| 2005 | 48.32 |
| 2006 | 48.27 |
| 2007 | 48.69 |
| 2008 | 48.82 |
| 2009 | |
| 2010 | 50.96 |
| 2011 | 50.63 |
| 2012 | 52.84 |
| 2013 | 53.54 |
| 2014 | 54.86 |
| 2015 | 55.92 |
| 2016 | 57.59 |
| 2017 | |
| 2018 | 64.85 |