| 年度 | 实际值 |
|---|---|
| 1992 | 183 |
| 1993 | 184 |
| 1994 | 184 |
| 1995 | 185 |
| 1996 | 185 |
| 1997 | 186 |
| 1998 | 186 |
| 1999 | 186 |
| 2000 | 187 |
| 2001 | 186 |
| 2002 | 186 |
| 2003 | 186.16 |
| 2004 | 186.14 |
| 2005 | 185.95 |
| 2006 | 185.69 |
| 2007 | 185.44 |
| 2008 | 185.07 |
| 2009 | |
| 2010 | 183.81 |
| 2011 | 183.5 |
| 2012 | 182.13 |
| 2013 | 181.07 |
| 2014 | 180.75 |
| 2015 | 179.53 |