| 年度 | 实际值 |
|---|---|
| 1994 | 258.12 |
| 1995 | 261.11 |
| 1996 | 262.74 |
| 1997 | 264.53 |
| 1998 | 265.29 |
| 1999 | 266.23 |
| 2000 | 268.58 |
| 2001 | 269.77 |
| 2002 | 270.86 |
| 2003 | 271.43 |
| 2004 | 272.95 |
| 2005 | 273.72 |
| 2006 | 275.67 |
| 2007 | 278.7 |
| 2008 | 280.4 |
| 2009 | |
| 2010 | 281.75 |
| 2011 | 281.3 |
| 2012 | 280 |
| 2013 | 279.9 |
| 2014 | |
| 2015 | 280.1 |
| 2016 | 280 |
| 2017 | 277 |
| 2018 | 276 |