| 年度 | 实际值 |
|---|---|
| 1992 | 297 |
| 1993 | 301 |
| 1994 | 304 |
| 1995 | 311 |
| 1996 | 316 |
| 1997 | 320 |
| 1998 | 172 |
| 1999 | 172 |
| 2000 | 173 |
| 2001 | 174 |
| 2002 | 175 |
| 2003 | 176.37 |
| 2004 | 177.6 |
| 2005 | 178.04 |
| 2006 | 179.54 |
| 2007 | 181.46 |
| 2008 | 182.79 |
| 2009 | |
| 2010 | 186.62 |
| 2011 | 187.64 |
| 2012 | 187.74 |
| 2013 | 187.35 |
| 2014 | 189.03 |
| 2015 | 190.23 |