| 年度 | 实际值 |
|---|---|
| 1992 | 27.88 |
| 1993 | 28.48 |
| 1994 | 28.64 |
| 1995 | 30.34 |
| 1996 | 31.05 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 34.62 |
| 2001 | 35.2 |
| 2002 | 36.22 |
| 2003 | 36.67 |
| 2004 | 42.16 |
| 2005 | 42.55 |
| 2006 | 49.54 |
| 2007 | 50.81 |
| 2008 | 51.88 |
| 2009 | |
| 2010 | 52.73 |
| 2011 | 61.5 |
| 2012 | 58.6 |
| 2013 | 53.3 |
| 2014 | 59.7 |
| 2015 | 59.95 |
| 2016 | 64 |
| 2017 | 64 |
| 2018 | 64 |