| 年度 | 实际值 |
|---|---|
| 1995 | 41.8 |
| 1996 | 40.6 |
| 1997 | 32.97 |
| 1998 | 46.1 |
| 1999 | 47 |
| 2000 | 49.1 |
| 2001 | 41.32 |
| 2002 | 42.25 |
| 2003 | 43.22 |
| 2004 | 43.59 |
| 2005 | 46.45 |
| 2006 | 45.59 |
| 2007 | 45.15 |
| 2008 | 45.28 |
| 2009 | |
| 2010 | 47.91 |
| 2011 | 49.22 |
| 2012 | 50.33 |
| 2013 | 50.77 |
| 2014 | 55.01 |
| 2015 | 56.99 |
| 2016 | 58.28 |
| 2017 | 60.98 |
| 2018 | 60.79 |