| 年度 | 实际值 |
|---|---|
| 1992 | 274 |
| 1993 | 277 |
| 1994 | 278 |
| 1995 | 284 |
| 1996 | 289 |
| 1997 | 287 |
| 1998 | 294 |
| 1999 | 297 |
| 2000 | 300 |
| 2001 | 302 |
| 2002 | 304 |
| 2003 | 305.55 |
| 2004 | 306.56 |
| 2005 | 309.36 |
| 2006 | 312.16 |
| 2007 | 315.01 |
| 2008 | 317.37 |
| 2009 | |
| 2010 | 322.4 |
| 2011 | 322.35 |
| 2012 | 316.78 |
| 2013 | 317.22 |
| 2014 | 317.93 |
| 2015 | 319.8 |