| 年度 | 实际值 |
|---|---|
| 1992 | 259 |
| 1993 | 264 |
| 1994 | 266 |
| 1995 | 272 |
| 1996 | 277 |
| 1997 | 280 |
| 1998 | 284 |
| 1999 | 285 |
| 2000 | 291 |
| 2001 | 294 |
| 2002 | 297 |
| 2003 | 275.72 |
| 2004 | 293.44 |
| 2005 | 298.27 |
| 2006 | 303.86 |
| 2007 | 309.11 |
| 2008 | 312.81 |
| 2009 | |
| 2010 | 319.9 |
| 2011 | 321.77 |
| 2012 | 320.76 |
| 2013 | 325.67 |
| 2014 | 328.03 |
| 2015 | 332.81 |