| 年度 | 实际值 |
|---|---|
| 1992 | 263 |
| 1993 | 265 |
| 1994 | 266 |
| 1995 | 269 |
| 1996 | 272 |
| 1997 | 275 |
| 1998 | 269 |
| 1999 | 270 |
| 2000 | 272 |
| 2001 | 273 |
| 2002 | 274 |
| 2003 | 275.01 |
| 2004 | 276.41 |
| 2005 | 275.45 |
| 2006 | 278.36 |
| 2007 | 280.61 |
| 2008 | 283.02 |
| 2009 | |
| 2010 | 286.17 |
| 2011 | 287.61 |
| 2012 | 289.06 |
| 2013 | 290.46 |
| 2014 | 291.42 |
| 2015 | 288.84 |