| 年度 | 实际值 |
|---|---|
| 1992 | 304 |
| 1993 | 306 |
| 1994 | 308 |
| 1995 | 314 |
| 1996 | 319 |
| 1997 | 322 |
| 1998 | 359 |
| 1999 | 388 |
| 2000 | 258 |
| 2001 | 261 |
| 2002 | 264 |
| 2003 | 267.41 |
| 2004 | 270.01 |
| 2005 | 273.84 |
| 2006 | 277.53 |
| 2007 | 280.97 |
| 2008 | 284.73 |
| 2009 | |
| 2010 | 288.53 |
| 2011 | 290.67 |
| 2012 | 258.92 |
| 2013 | 296.46 |
| 2014 | 264.92 |
| 2015 | 262.4 |