| 年度 | 实际值 |
|---|---|
| 1995 | 48.6 |
| 1996 | 49.6 |
| 1997 | 55.68 |
| 1998 | 50.8 |
| 1999 | 53.4 |
| 2000 | 55.1 |
| 2001 | 53.28 |
| 2002 | 52.93 |
| 2003 | 56.75 |
| 2004 | 59.56 |
| 2005 | 61.51 |
| 2006 | 62.94 |
| 2007 | 61.06 |
| 2008 | 63.18 |
| 2009 | |
| 2010 | 49.17 |
| 2011 | 53.02 |
| 2012 | 48.03 |
| 2013 | 48.48 |
| 2014 | 49.31 |
| 2015 | 46.59 |
| 2016 | 47.61 |
| 2017 | 45.22 |
| 2018 | 42.47 |