| 年度 | 实际值 |
|---|---|
| 1992 | 239.32 |
| 1993 | 240.6 |
| 1994 | 241.97 |
| 1995 | 243 |
| 1996 | 244 |
| 1997 | 245.09 |
| 1998 | 245.75 |
| 1999 | 246.22 |
| 2000 | 246.95 |
| 2001 | 247.22 |
| 2002 | 247.62 |
| 2003 | 247.63 |
| 2004 | 248.39 |
| 2005 | 249.09 |
| 2006 | 249.83 |
| 2007 | 251.06 |
| 2008 | 252.23 |
| 2009 | |
| 2010 | 253.61 |
| 2011 | 253.8 |
| 2012 | 253.6 |
| 2013 | 253.8 |
| 2014 | |
| 2015 | 254.75 |
| 2016 | 256 |
| 2017 | 256 |
| 2018 | 257 |