| 年度 | 实际值 |
|---|---|
| 1995 | 49.9 |
| 1996 | 39.1 |
| 1997 | 35.86 |
| 1998 | 43.4 |
| 1999 | 45.8 |
| 2000 | 51.5 |
| 2001 | 58.77 |
| 2002 | 68.29 |
| 2003 | 65.45 |
| 2004 | 58.02 |
| 2005 | 67.93 |
| 2006 | 69.37 |
| 2007 | 69.24 |
| 2008 | 70.09 |
| 2009 | |
| 2010 | 73.14 |
| 2011 | 71.7 |
| 2012 | 72.23 |
| 2013 | 72.08 |
| 2014 | 74.36 |
| 2015 | 75.24 |
| 2016 | 76.58 |
| 2017 | 77.29 |
| 2018 | 79.71 |