| 年度 | 实际值 |
|---|---|
| 1995 | 41.4 |
| 1996 | 41.2 |
| 1997 | 42.2 |
| 1998 | 43.5 |
| 1999 | 44.4 |
| 2000 | 44.7 |
| 2001 | 45.52 |
| 2002 | 46.25 |
| 2003 | 46.17 |
| 2004 | 44.78 |
| 2005 | 47.81 |
| 2006 | 47.09 |
| 2007 | 47.3 |
| 2008 | 50.29 |
| 2009 | |
| 2010 | 49.01 |
| 2011 | 48.4 |
| 2012 | 48.93 |
| 2013 | 50.03 |
| 2014 | 53.67 |
| 2015 | 55.28 |
| 2016 | 56.73 |
| 2017 | |
| 2018 | 56.59 |