| 年度 | 实际值 |
|---|---|
| 1995 | 53.3 |
| 1996 | 54.8 |
| 1997 | 87.99 |
| 1998 | 51.5 |
| 1999 | 53.4 |
| 2000 | 56.3 |
| 2001 | 57.39 |
| 2002 | 58.76 |
| 2003 | 59.72 |
| 2004 | 62.75 |
| 2005 | 55.63 |
| 2006 | 58.49 |
| 2007 | 58.44 |
| 2008 | 59.91 |
| 2009 | |
| 2010 | 64.42 |
| 2011 | 68.6 |
| 2012 | 68.29 |
| 2013 | 62.51 |
| 2014 | 42.81 |
| 2015 | 48.58 |
| 2016 | 49.1 |
| 2017 | 50.89 |
| 2018 | 51.36 |