| 年度 | 实际值 |
|---|---|
| 1995 | 47.8 |
| 1996 | 47.8 |
| 1997 | 52.25 |
| 1998 | 49.5 |
| 1999 | 49.9 |
| 2000 | 48.5 |
| 2001 | 46.38 |
| 2002 | 47.05 |
| 2003 | 46.34 |
| 2004 | 47.57 |
| 2005 | 51 |
| 2006 | 53.8 |
| 2007 | 58.77 |
| 2008 | 59.97 |
| 2009 | |
| 2010 | 61.93 |
| 2011 | 63.52 |
| 2012 | 62.25 |
| 2013 | 61.04 |
| 2014 | 57.02 |
| 2015 | 53.95 |
| 2016 | 52.23 |
| 2017 | 49.77 |
| 2018 | 49.57 |