| 年度 | 实际值 |
|---|---|
| 1995 | 41.1 |
| 1996 | 39.1 |
| 1997 | 41.19 |
| 1998 | 41.6 |
| 1999 | 42.8 |
| 2000 | 42.2 |
| 2001 | 42.87 |
| 2002 | 47.74 |
| 2003 | 47.82 |
| 2004 | 48.49 |
| 2005 | 56.31 |
| 2006 | 55.29 |
| 2007 | 56.62 |
| 2008 | 56.16 |
| 2009 | |
| 2010 | 58.71 |
| 2011 | 58.69 |
| 2012 | 58.68 |
| 2013 | 63.05 |
| 2014 | 66.36 |
| 2015 | 67.86 |
| 2016 | 68.56 |
| 2017 | |
| 2018 | 68.67 |