| 年度 | 实际值 |
|---|---|
| 1995 | 43 |
| 1996 | 46.2 |
| 1997 | 48.22 |
| 1998 | 49.6 |
| 1999 | 50.4 |
| 2000 | 52.6 |
| 2001 | 52.65 |
| 2002 | 55.25 |
| 2003 | 58.85 |
| 2004 | 61.09 |
| 2005 | 62.01 |
| 2006 | 62.08 |
| 2007 | 61.78 |
| 2008 | 61.14 |
| 2009 | |
| 2010 | 55.9 |
| 2011 | 53.97 |
| 2012 | 53.44 |
| 2013 | 51.49 |
| 2014 | 48.56 |
| 2015 | 47.38 |
| 2016 | 45.56 |
| 2017 | |
| 2018 | 43.97 |