| 年度 | 实际值 |
|---|---|
| 1995 | 65 |
| 1996 | 65.4 |
| 1997 | 39.89 |
| 1998 | 57.7 |
| 1999 | 54.6 |
| 2000 | 54.2 |
| 2001 | 53.64 |
| 2002 | 54.75 |
| 2003 | 55.14 |
| 2004 | 55.29 |
| 2005 | 59.04 |
| 2006 | 57.12 |
| 2007 | 55.91 |
| 2008 | 59.88 |
| 2009 | |
| 2010 | 60.98 |
| 2011 | 67.04 |
| 2012 | 68.91 |
| 2013 | 69.19 |
| 2014 | 68.72 |
| 2015 | 68.32 |
| 2016 | 68.41 |
| 2017 | 71.34 |
| 2018 | 71.06 |