| 年度 | 实际值 |
|---|---|
| 1992 | 178 |
| 1993 | 179 |
| 1994 | 179 |
| 1995 | 181 |
| 1996 | 182 |
| 1997 | 183 |
| 1998 | 183 |
| 1999 | 185 |
| 2000 | 185 |
| 2001 | 186 |
| 2002 | 186 |
| 2003 | 186.39 |
| 2004 | 186.29 |
| 2005 | 186.5 |
| 2006 | 187.57 |
| 2007 | 188.43 |
| 2008 | 190.25 |
| 2009 | |
| 2010 | 190.51 |
| 2011 | 190.73 |
| 2012 | 191.12 |
| 2013 | 190.19 |
| 2014 | 190.14 |
| 2015 | 186.99 |