| 年度 | 实际值 |
|---|---|
| 1995 | 38.9 |
| 1996 | 42.2 |
| 1997 | 68.82 |
| 1998 | 42 |
| 1999 | 43.4 |
| 2000 | 43.4 |
| 2001 | 43.42 |
| 2002 | 42.89 |
| 2003 | 41.6 |
| 2004 | 40.97 |
| 2005 | 40.91 |
| 2006 | 40.91 |
| 2007 | 44.98 |
| 2008 | 41.48 |
| 2009 | |
| 2010 | 49.79 |
| 2011 | 48.92 |
| 2012 | 49.29 |
| 2013 | 50.83 |
| 2014 | 50.69 |
| 2015 | 52.08 |
| 2016 | 58.23 |
| 2017 | 56.03 |
| 2018 | 56.35 |