| 年度 | 实际值 |
|---|---|
| 1995 | 48 |
| 1996 | 49.3 |
| 1997 | 49.05 |
| 1998 | 49.2 |
| 1999 | 49.3 |
| 2000 | 49.4 |
| 2001 | 49.94 |
| 2002 | 50.09 |
| 2003 | 47.18 |
| 2004 | 44.69 |
| 2005 | 50.45 |
| 2006 | 49.42 |
| 2007 | 46.54 |
| 2008 | 45.14 |
| 2009 | |
| 2010 | 44.94 |
| 2011 | 44.12 |
| 2012 | 43.99 |
| 2013 | 43.84 |
| 2014 | 45.53 |
| 2015 | 47.53 |
| 2016 | 56.41 |
| 2017 | |
| 2018 | 58.1 |