| 年度 | 实际值 |
|---|---|
| 1992 | 287 |
| 1993 | 287 |
| 1994 | 287 |
| 1995 | 289 |
| 1996 | 171 |
| 1997 | 172 |
| 1998 | 174 |
| 1999 | 175 |
| 2000 | 176 |
| 2001 | 177 |
| 2002 | 179 |
| 2003 | 179.83 |
| 2004 | 182.83 |
| 2005 | 183.7 |
| 2006 | 184.74 |
| 2007 | 186.05 |
| 2008 | 186.53 |
| 2009 | |
| 2010 | 186.93 |
| 2011 | 187.17 |
| 2012 | 187.22 |
| 2013 | 187.53 |
| 2014 | 186.04 |
| 2015 | 180.98 |