| 年度 | 实际值 |
|---|---|
| 1992 | 258 |
| 1993 | 253 |
| 1994 | 255 |
| 1995 | 261 |
| 1996 | 266 |
| 1997 | 269 |
| 1998 | 266 |
| 1999 | 270 |
| 2000 | 278 |
| 2001 | 280 |
| 2002 | 277 |
| 2003 | 284.72 |
| 2004 | 289.19 |
| 2005 | 291.4 |
| 2006 | 295.3 |
| 2007 | 298.53 |
| 2008 | 302.55 |
| 2009 | |
| 2010 | 151.73 |
| 2011 | 156.61 |
| 2012 | 156.56 |
| 2013 | 156.03 |
| 2014 | 147.72 |
| 2015 | 137.14 |