| 年度 | 实际值 |
|---|---|
| 1992 | 249.83 |
| 1993 | 251.92 |
| 1994 | 254.45 |
| 1995 | 257.44 |
| 1996 | 260.64 |
| 1997 | 263.03 |
| 1998 | 265.42 |
| 1999 | 266.82 |
| 2000 | 268.5 |
| 2001 | 270.48 |
| 2002 | 271.84 |
| 2003 | 273.37 |
| 2004 | 274.61 |
| 2005 | 275.56 |
| 2006 | 276.53 |
| 2007 | 277.45 |
| 2008 | 278.17 |
| 2009 | |
| 2010 | 278.77 |
| 2011 | 280.8 |
| 2012 | 281 |
| 2013 | 282.4 |
| 2014 | 284.5 |
| 2015 | 285.8 |
| 2016 | 288 |
| 2017 | 288 |
| 2018 | 289 |