| 年度 | 实际值 |
|---|---|
| 1992 | 57.2 |
| 1993 | |
| 1994 | |
| 1995 | 58.1 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 58.9 |
| 2000 | 59.5 |
| 2001 | 60 |
| 2002 | 60.7 |
| 2003 | 62 |
| 2004 | 64 |
| 2005 | 66 |
| 2006 | 67 |
| 2007 | 67.98 |
| 2008 | 69.04 |
| 2009 | 69.99 |
| 2010 | 71.13 |
| 2011 | 72.36 |
| 2012 | 73.7565 |
| 2013 | 75.29 |
| 2014 | 76.97 |
| 2015 | 78.7 |
| 2016 | 82.4 |
| 2017 | 86.3 |
| 2018 | 90.32 |