| 年度 | 实际值 |
|---|---|
| 1992 | 252.21 |
| 1993 | 254.71 |
| 1994 | 257.11 |
| 1995 | 259.96 |
| 1996 | 261.16 |
| 1997 | 261.87 |
| 1998 | 262.93 |
| 1999 | 264.41 |
| 2000 | 266.29 |
| 2001 | 268.2 |
| 2002 | 270.46 |
| 2003 | 273.29 |
| 2004 | 275.82 |
| 2005 | 278.64 |
| 2006 | 280.54 |
| 2007 | 283.31 |
| 2008 | 285.85 |
| 2009 | |
| 2010 | 288.3 |
| 2011 | 289.8 |
| 2012 | 291.2 |
| 2013 | 292.7 |
| 2014 | |
| 2015 | 295.64 |
| 2016 | 298 |
| 2017 | 298 |
| 2018 | 300 |