| 年度 | 实际值 |
|---|---|
| 1995 | 59.9 |
| 1996 | 58.6 |
| 1997 | 41.94 |
| 1998 | 59.3 |
| 1999 | 59 |
| 2000 | 57.5 |
| 2001 | 58.08 |
| 2002 | 57.48 |
| 2003 | 55.72 |
| 2004 | 51.65 |
| 2005 | 54.21 |
| 2006 | 53.69 |
| 2007 | 53.12 |
| 2008 | 52.99 |
| 2009 | |
| 2010 | 54.2 |
| 2011 | 54.4 |
| 2012 | 58.68 |
| 2013 | 58.99 |
| 2014 | 60.58 |
| 2015 | 59.84 |
| 2016 | 61.52 |
| 2017 | 64.24 |
| 2018 | 67.79 |