| 年度 | 实际值 |
|---|---|
| 1992 | 71.2 |
| 1993 | |
| 1994 | |
| 1995 | 73.9 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 75.1 |
| 2000 | 75.5253 |
| 2001 | 75.6695 |
| 2002 | 75.3617 |
| 2003 | 75.5478 |
| 2004 | 76.0905 |
| 2005 | 76.96 |
| 2006 | 76.81 |
| 2007 | 76.51 |
| 2008 | 76.62 |
| 2009 | 78.2962 |
| 2010 | 79.1246 |
| 2011 | 79.9459 |
| 2012 | 79.9364 |
| 2013 | 80.8236 |
| 2014 | 74.94 |
| 2015 | 75.17 |
| 2016 | 80 |
| 2017 | 80 |