| 年度 | 实际值 |
|---|---|
| 1992 | 26.07 |
| 1993 | 26.73 |
| 1994 | 27.69 |
| 1995 | 28.53 |
| 1996 | 29.7 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 32.45 |
| 2001 | 32.86 |
| 2002 | 57.04 |
| 2003 | 57.74 |
| 2004 | 58.87 |
| 2005 | 60.27 |
| 2006 | 61.7 |
| 2007 | 62.93 |
| 2008 | 64.09 |
| 2009 | |
| 2010 | 66.14 |
| 2011 | 91.9 |
| 2012 | 81.5 |
| 2013 | 80.6 |
| 2014 | 83.3 |
| 2015 | 84.31 |
| 2016 | 86 |
| 2017 | 85 |
| 2018 | 85 |