| 年度 | 实际值 |
|---|---|
| 1995 | 50.3 |
| 1996 | 49.5 |
| 1997 | 50.03 |
| 1998 | 51.5 |
| 1999 | 51.9 |
| 2000 | 53.4 |
| 2001 | 47.12 |
| 2002 | 49.06 |
| 2003 | 50.54 |
| 2004 | 53.14 |
| 2005 | 57.81 |
| 2006 | 58.68 |
| 2007 | 59.21 |
| 2008 | 60.31 |
| 2009 | |
| 2010 | 62.95 |
| 2011 | 63.73 |
| 2012 | 65.19 |
| 2013 | 65.82 |
| 2014 | 64.01 |
| 2015 | 63.85 |
| 2016 | 63.51 |
| 2017 | |
| 2018 | 63.31 |