| 年度 | 实际值 |
|---|---|
| 1992 | 52.51 |
| 1993 | 54.03 |
| 1994 | 55.04 |
| 1995 | 56.13 |
| 1996 | 56.64 |
| 1997 | 57.28 |
| 1998 | 57.17 |
| 1999 | 57.19 |
| 2000 | 101.04 |
| 2001 | 57.1 |
| 2002 | 57.29 |
| 2003 | 57.33 |
| 2004 | 56.69 |
| 2005 | 55.69 |
| 2006 | 55.65 |
| 2007 | 55.76 |
| 2008 | 55.59 |
| 2009 | 55.86 |
| 2010 | 55.97 |
| 2011 | 55.49 |
| 2012 | 55.51 |
| 2013 | 55.55 |
| 2014 | 55.38 |
| 2015 | 58.54 |