| 年度 | 实际值 |
|---|---|
| 1995 | 50 |
| 1996 | 59.9 |
| 1997 | 59.56 |
| 1998 | 58.9 |
| 1999 | 59 |
| 2000 | 59.6 |
| 2001 | 62.03 |
| 2002 | 62.92 |
| 2003 | 62.19 |
| 2004 | 60.55 |
| 2005 | 69.52 |
| 2006 | 71.29 |
| 2007 | 72.43 |
| 2008 | 73.6 |
| 2009 | |
| 2010 | 75.94 |
| 2011 | 76.48 |
| 2012 | 76.86 |
| 2013 | 77.26 |
| 2014 | 77.82 |
| 2015 | 79.65 |
| 2016 | 80.23 |
| 2017 | 80.56 |
| 2018 | 80.98 |