| 年度 | 实际值 |
|---|---|
| 1992 | 244.94 |
| 1993 | 248.67 |
| 1994 | 252.35 |
| 1995 | 254.74 |
| 1996 | 257.23 |
| 1997 | 259.71 |
| 1998 | 262.4 |
| 1999 | 264.17 |
| 2000 | 267.78 |
| 2001 | 270.68 |
| 2002 | 273.23 |
| 2003 | 274.78 |
| 2004 | 278.09 |
| 2005 | 281.11 |
| 2006 | 287.71 |
| 2007 | 293.43 |
| 2008 | 298.31 |
| 2009 | |
| 2010 | 302.01 |
| 2011 | 297.1 |
| 2012 | 299.2 |
| 2013 | 301.2 |
| 2014 | 304.3 |
| 2015 | 304.9 |
| 2016 | 398 |
| 2017 | 400 |
| 2018 | 400 |