| 年度 | 实际值 |
|---|---|
| 1992 | 208 |
| 1993 | 180 |
| 1994 | 180 |
| 1995 | 182 |
| 1996 | 184 |
| 1997 | 184 |
| 1998 | 185 |
| 1999 | 185 |
| 2000 | 185 |
| 2001 | 186 |
| 2002 | 186 |
| 2003 | 186.4 |
| 2004 | 186.19 |
| 2005 | 186.07 |
| 2006 | 186.35 |
| 2007 | 186.45 |
| 2008 | 185.86 |
| 2009 | |
| 2010 | 185.78 |
| 2011 | 184.68 |
| 2012 | 185.01 |
| 2013 | 184.54 |
| 2014 | 184.46 |
| 2015 | 182.52 |