| 年度 | 实际值 |
|---|---|
| 1992 | 606 |
| 1993 | 487 |
| 1994 | 489 |
| 1995 | 498 |
| 1996 | 503 |
| 1997 | 508 |
| 1998 | 512 |
| 1999 | 517 |
| 2000 | 561 |
| 2001 | 567 |
| 2002 | 568 |
| 2003 | 571.17 |
| 2004 | 569.25 |
| 2005 | 567.91 |
| 2006 | 577.61 |
| 2007 | 579.98 |
| 2008 | 589.29 |
| 2009 | |
| 2010 | 596.02 |
| 2011 | 593.61 |
| 2012 | 591.4 |
| 2013 | 591.95 |
| 2014 | 590.03 |
| 2015 | 590.35 |