| 年度 | 实际值 |
|---|---|
| 1992 | 245 |
| 1993 | 247 |
| 1994 | 248 |
| 1995 | 250 |
| 1996 | 252 |
| 1997 | 253 |
| 1998 | 255 |
| 1999 | 257 |
| 2000 | 256 |
| 2001 | 257 |
| 2002 | 258 |
| 2003 | 260.05 |
| 2004 | 260.81 |
| 2005 | 261.61 |
| 2006 | 262.89 |
| 2007 | 265.18 |
| 2008 | 267.03 |
| 2009 | |
| 2010 | 267.6 |
| 2011 | 267.84 |
| 2012 | 269.36 |
| 2013 | 270.34 |
| 2014 | 271.03 |
| 2015 | 269.16 |