| 年度 | 实际值 |
|---|---|
| 1992 | 224.8 |
| 1993 | 228.57 |
| 1994 | 233.18 |
| 1995 | 238.75 |
| 1996 | 244.07 |
| 1997 | 247.65 |
| 1998 | 250.24 |
| 1999 | 253.02 |
| 2000 | 253.24 |
| 2001 | 255.3 |
| 2002 | 257.41 |
| 2003 | 259.2 |
| 2004 | 261.25 |
| 2005 | 261.6 |
| 2006 | 266.75 |
| 2007 | 269.35 |
| 2008 | 272.87 |
| 2009 | |
| 2010 | 278.47 |
| 2011 | 276.4 |
| 2012 | 275 |
| 2013 | 274.2 |
| 2014 | |
| 2015 | 268.04 |
| 2016 | 269 |
| 2017 | 267 |
| 2018 | 267 |