| 年度 | 实际值 |
|---|---|
| 1992 | 50.85 |
| 1993 | 51.63 |
| 1994 | 52.26 |
| 1995 | 52.98 |
| 1996 | 26.45 |
| 1997 | 27.16 |
| 1998 | 27.5 |
| 1999 | 27.69 |
| 2000 | 27.95 |
| 2001 | 28.0498 |
| 2002 | 28.1234 |
| 2003 | 28.2606 |
| 2004 | 28.3221 |
| 2005 | 28.471 |
| 2006 | 28.6548 |
| 2007 | 28.7154 |
| 2008 | 29.2229 |
| 2009 | 29.6339 |
| 2010 | 29.63 |
| 2011 | 30.6 |
| 2012 | 30.6 |
| 2013 | 31.1 |
| 2014 | 31.6 |
| 2015 | 33.32 |
| 2016 | 68 |
| 2017 | 68 |
| 2018 | 69 |