| 年度 | 实际值 |
|---|---|
| 1995 | 53.4 |
| 1996 | 54 |
| 1997 | 51.04 |
| 1998 | 55.1 |
| 1999 | 55.7 |
| 2000 | 59.3 |
| 2001 | 58.75 |
| 2002 | 58.34 |
| 2003 | 60.18 |
| 2004 | 57.42 |
| 2005 | 65.63 |
| 2006 | 65.5 |
| 2007 | 65.06 |
| 2008 | 54.77 |
| 2009 | |
| 2010 | 58.12 |
| 2011 | 52.06 |
| 2012 | 52.04 |
| 2013 | 52.99 |
| 2014 | 54.72 |
| 2015 | 56.48 |
| 2016 | 60.31 |
| 2017 | 63.69 |
| 2018 | 66.31 |