| 年度 | 实际值 |
|---|---|
| 1995 | 42.4 |
| 1996 | 44.5 |
| 1997 | 35.64 |
| 1998 | 45.4 |
| 1999 | |
| 2000 | 47.7 |
| 2001 | 50.21 |
| 2002 | 50.01 |
| 2003 | 50.67 |
| 2004 | 49.86 |
| 2005 | 52.73 |
| 2006 | 53.3 |
| 2007 | 51.76 |
| 2008 | 51.47 |
| 2009 | |
| 2010 | 52.15 |
| 2011 | 47.98 |
| 2012 | 47.04 |
| 2013 | 44.87 |
| 2014 | 44.68 |
| 2015 | 45.3 |
| 2016 | 47.03 |
| 2017 | 47.98 |
| 2018 | 45.47 |