| 年度 | 实际值 |
|---|---|
| 1992 | 67.04 |
| 1993 | 67.32 |
| 1994 | 67.51 |
| 1995 | 67.81 |
| 1996 | 68.04 |
| 1997 | 68.22 |
| 1998 | 68.37 |
| 1999 | 68.5 |
| 2000 | 68.81 |
| 2001 | 68.85 |
| 2002 | 69.1 |
| 2003 | 68.96 |
| 2004 | 69.04 |
| 2005 | 69.11 |
| 2006 | 69.19 |
| 2007 | 69.45 |
| 2008 | 69.58 |
| 2009 | 69.66 |
| 2010 | 69.72 |
| 2011 | 70.04 |
| 2012 | 70.35 |
| 2013 | 70.63 |
| 2014 | 70.9 |
| 2015 | 70.96 |
| 2016 | 71.109 |
| 2017 | 71 |
| 2018 | 71 |