| 年度 | 实际值 |
|---|---|
| 1995 | 45.3 |
| 1996 | 46.3 |
| 1997 | 48.94 |
| 1998 | 50.5 |
| 1999 | 50.2 |
| 2000 | 54.1 |
| 2001 | 54.2 |
| 2002 | 55.33 |
| 2003 | 59.06 |
| 2004 | 60.1 |
| 2005 | 62.28 |
| 2006 | 63.93 |
| 2007 | 67.01 |
| 2008 | 68.35 |
| 2009 | |
| 2010 | 69.74 |
| 2011 | 69.14 |
| 2012 | 68.49 |
| 2013 | 67.8 |
| 2014 | 63.71 |
| 2015 | 62.92 |
| 2016 | 62.35 |
| 2017 | |
| 2018 | 59.94 |