| 年度 | 实际值 |
|---|---|
| 1992 | 293.41 |
| 1993 | 297.02 |
| 1994 | 299.48 |
| 1995 | 301.82 |
| 1996 | 304.18 |
| 1997 | 306.02 |
| 1998 | 307.63 |
| 1999 | 309.91 |
| 2000 | 312.21 |
| 2001 | 316.16 |
| 2002 | 318.3 |
| 2003 | 316.78 |
| 2004 | 318.19 |
| 2005 | 316.42 |
| 2006 | 320.1 |
| 2007 | 323.8 |
| 2008 | 327.4 |
| 2009 | |
| 2010 | 331.54 |
| 2011 | 334.3 |
| 2012 | 336.1 |
| 2013 | 338.6 |
| 2014 | |
| 2015 | 336.85 |
| 2016 | 339 |
| 2017 | 338 |
| 2018 | 339 |