| 年度 | 实际值 |
|---|---|
| 1992 | 538 |
| 1993 | 541 |
| 1994 | 543 |
| 1995 | 548 |
| 1996 | 551 |
| 1997 | 559 |
| 1998 | 565 |
| 1999 | 558 |
| 2000 | 562 |
| 2001 | 564 |
| 2002 | 310 |
| 2003 | 310.81 |
| 2004 | 312.26 |
| 2005 | 311.85 |
| 2006 | 312.55 |
| 2007 | 313.34 |
| 2008 | 316.13 |
| 2009 | |
| 2010 | 314.71 |
| 2011 | 315.79 |
| 2012 | 315.5 |
| 2013 | 316.25 |
| 2014 | 310.76 |
| 2015 | 307.56 |