| 年度 | 实际值 |
|---|---|
| 1992 | 15.89 |
| 1993 | 160.28 |
| 1994 | 161.2 |
| 1995 | 162.27 |
| 1996 | 164.01 |
| 1997 | 165.59 |
| 1998 | 167.04 |
| 1999 | 168.36 |
| 2000 | 171.44 |
| 2001 | 172.89 |
| 2002 | 173.79 |
| 2003 | 173.55 |
| 2004 | 174.07 |
| 2005 | 174.6 |
| 2006 | 173.49 |
| 2007 | 173.97 |
| 2008 | 173.9 |
| 2009 | |
| 2010 | 174.21 |
| 2011 | 174.6 |
| 2012 | 172.8 |
| 2013 | 171.5 |
| 2014 | |
| 2015 | 168 |
| 2016 | 163 |
| 2017 | 161 |
| 2018 | 159 |