| 年度 | 实际值 |
|---|---|
| 1992 | 522.9 |
| 1993 | 527.09 |
| 1994 | 531.53 |
| 1995 | 534.66 |
| 1996 | 537.4 |
| 1997 | 540.36 |
| 1998 | 543.24 |
| 1999 | 545.31 |
| 2000 | 551.47 |
| 2001 | 554.61 |
| 2002 | 557.93 |
| 2003 | 560.16 |
| 2004 | 561.6 |
| 2005 | 565.33 |
| 2006 | 572.08 |
| 2007 | 578.19 |
| 2008 | 583.37 |
| 2009 | |
| 2010 | 586.44 |
| 2011 | 588.5 |
| 2012 | 590.3 |
| 2013 | 591.5 |
| 2014 | |
| 2015 | 593.56 |
| 2016 | 596 |
| 2017 | 595 |
| 2018 | 595 |