| 年度 | 实际值 |
|---|---|
| 1992 | 290.24 |
| 1993 | 291.08 |
| 1994 | 292.72 |
| 1995 | 294.61 |
| 1996 | 296.3 |
| 1997 | 297.79 |
| 1998 | 299.16 |
| 1999 | 301.39 |
| 2000 | 302.58 |
| 2001 | 303.2 |
| 2002 | 303.76 |
| 2003 | 304.08 |
| 2004 | 303.91 |
| 2005 | 304.26 |
| 2006 | 306 |
| 2007 | 307.41 |
| 2008 | 310.37 |
| 2009 | |
| 2010 | 310.89 |
| 2011 | 311.3 |
| 2012 | 311.7 |
| 2013 | 310.2 |
| 2014 | |
| 2015 | 305.31 |
| 2016 | 305 |
| 2017 | 303 |
| 2018 | 301 |