| 年度 | 实际值 |
|---|---|
| 1995 | 45.2 |
| 1996 | 47.6 |
| 1997 | 49.66 |
| 1998 | 51.1 |
| 1999 | 52.3 |
| 2000 | 53.2 |
| 2001 | 55.99 |
| 2002 | 56.83 |
| 2003 | 51.42 |
| 2004 | 51.14 |
| 2005 | 51.49 |
| 2006 | 50.39 |
| 2007 | 50.4 |
| 2008 | 49.91 |
| 2009 | |
| 2010 | 50.21 |
| 2011 | 48.67 |
| 2012 | 48.72 |
| 2013 | 47.89 |
| 2014 | 48.51 |
| 2015 | 49.68 |
| 2016 | 50.79 |
| 2017 | |
| 2018 | 59.1 |