| 年度 | 实际值 |
|---|---|
| 1992 | 29.48 |
| 1993 | 30.02 |
| 1994 | 31.74 |
| 1995 | 31.01 |
| 1996 | 31.36 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 48.35 |
| 2001 | 48.1 |
| 2002 | 51.16 |
| 2003 | 49.86 |
| 2004 | 50.6 |
| 2005 | 51.17 |
| 2006 | 51.78 |
| 2007 | 53.49 |
| 2008 | 53.33 |
| 2009 | |
| 2010 | 53.66 |
| 2011 | 55.1 |
| 2012 | 55.5 |
| 2013 | 56 |
| 2014 | 57.7 |
| 2015 | 58.17 |
| 2016 | 59 |
| 2017 | 59 |
| 2018 | 60 |