| 年度 | 实际值 |
|---|---|
| 1992 | 416.78 |
| 1993 | 419.28 |
| 1994 | 421.15 |
| 1995 | 425.43 |
| 1996 | 425.97 |
| 1997 | 427.63 |
| 1998 | 427.59 |
| 1999 | 430.01 |
| 2000 | 431.67 |
| 2001 | 431.4 |
| 2002 | 431.07 |
| 2003 | 431.6 |
| 2004 | 429.07 |
| 2005 | 429.45 |
| 2006 | 430.44 |
| 2007 | 432.66 |
| 2008 | 433.58 |
| 2009 | 434.19 |
| 2010 | 434.03 |
| 2011 | 433.31 |
| 2012 | 430.79 |
| 2013 | 429.11 |
| 2014 | 427.65 |
| 2015 | 426.24 |
| 2016 | 422 |
| 2017 | 415 |
| 2018 | 414 |