| 年度 | 实际值 |
|---|---|
| 1992 | 22.3 |
| 1993 | 72.28 |
| 1994 | 74.91 |
| 1995 | 76.91 |
| 1996 | 77.45 |
| 1997 | 78.39 |
| 1998 | 78.69 |
| 1999 | 78.75 |
| 2000 | 170.53 |
| 2001 | 79.5 |
| 2002 | 79.95 |
| 2003 | 80.57 |
| 2004 | 80.69 |
| 2005 | 80.92 |
| 2006 | 80.53 |
| 2007 | 80.67 |
| 2008 | 80.74 |
| 2009 | 80.99 |
| 2010 | 81.03 |
| 2011 | 80.81 |
| 2012 | 80.17 |
| 2013 | 79.66 |
| 2014 | 78.92 |
| 2015 | 84.84 |