| 年度 | 实际值 |
|---|---|
| 1992 | 157 |
| 1993 | 158 |
| 1994 | 158 |
| 1995 | 160 |
| 1996 | 160 |
| 1997 | 161 |
| 1998 | 161 |
| 1999 | 161 |
| 2000 | 158 |
| 2001 | 158 |
| 2002 | 159 |
| 2003 | 160.49 |
| 2004 | 160.33 |
| 2005 | 161.27 |
| 2006 | 161.36 |
| 2007 | 161.54 |
| 2008 | 161.48 |
| 2009 | |
| 2010 | 157.85 |
| 2011 | 157.67 |
| 2012 | 157.28 |
| 2013 | 156.74 |
| 2014 | 156.62 |
| 2015 | 155.66 |