| 年度 | 实际值 |
|---|---|
| 1992 | 321.03 |
| 1993 | 322.97 |
| 1994 | 326.24 |
| 1995 | 328.17 |
| 1996 | 329.76 |
| 1997 | 330.84 |
| 1998 | 331.44 |
| 1999 | 332.22 |
| 2000 | 334.26 |
| 2001 | 334.61 |
| 2002 | 335.16 |
| 2003 | 336.5 |
| 2004 | 336.8 |
| 2005 | 338.74 |
| 2006 | 340.08 |
| 2007 | 340.16 |
| 2008 | 340.92 |
| 2009 | |
| 2010 | 339.24 |
| 2011 | 341 |
| 2012 | 340.6 |
| 2013 | 339.5 |
| 2014 | |
| 2015 | 340.9 |
| 2016 | 341 |
| 2017 | 336 |
| 2018 | 336 |