| 年度 | 实际值 |
|---|---|
| 1992 | 240 |
| 1993 | 242 |
| 1994 | 243 |
| 1995 | 248 |
| 1996 | 233 |
| 1997 | 236 |
| 1998 | 239 |
| 1999 | 242 |
| 2000 | 241 |
| 2001 | 241 |
| 2002 | 242 |
| 2003 | 242.34 |
| 2004 | 240.57 |
| 2005 | 234.66 |
| 2006 | 237.74 |
| 2007 | 240.7 |
| 2008 | 241.95 |
| 2009 | |
| 2010 | 242.18 |
| 2011 | 243.39 |
| 2012 | 243.72 |
| 2013 | 242.49 |
| 2014 | 242.09 |
| 2015 | 241.05 |