| 年度 | 实际值 |
|---|---|
| 1992 | 186 |
| 1993 | 187 |
| 1994 | 188 |
| 1995 | 189 |
| 1996 | 190 |
| 1997 | 190 |
| 1998 | 189 |
| 1999 | 189 |
| 2000 | 189 |
| 2001 | 189 |
| 2002 | 189 |
| 2003 | 188.56 |
| 2004 | 189.34 |
| 2005 | 189.46 |
| 2006 | 190.15 |
| 2007 | 190.74 |
| 2008 | 190.44 |
| 2009 | |
| 2010 | 189.03 |
| 2011 | 189.17 |
| 2012 | 189.23 |
| 2013 | 189.76 |
| 2014 | 189.91 |
| 2015 | 187.47 |