| 年度 | 实际值 |
|---|---|
| 1995 | 55.9 |
| 1996 | 55.5 |
| 1997 | 35.52 |
| 1998 | 35.9 |
| 1999 | 37.9 |
| 2000 | 42.1 |
| 2001 | 45.59 |
| 2002 | 47.6 |
| 2003 | 48.84 |
| 2004 | 47.65 |
| 2005 | 45.33 |
| 2006 | 44.87 |
| 2007 | 43.04 |
| 2008 | 41.68 |
| 2009 | |
| 2010 | 42.76 |
| 2011 | 40.33 |
| 2012 | 40.62 |
| 2013 | 41.95 |
| 2014 | 41.85 |
| 2015 | 43.68 |
| 2016 | 47.46 |
| 2017 | |
| 2018 | 57.04 |