| 年度 | 实际值 |
|---|---|
| 1995 | 37 |
| 1996 | 39.7 |
| 1997 | 29.62 |
| 1998 | 43.9 |
| 1999 | 44.5 |
| 2000 | 43 |
| 2001 | 41.77 |
| 2002 | 42.59 |
| 2003 | 41.18 |
| 2004 | 40.05 |
| 2005 | 37.3 |
| 2006 | 38.5 |
| 2007 | 39.63 |
| 2008 | 40.02 |
| 2009 | |
| 2010 | 39.39 |
| 2011 | 39.6 |
| 2012 | 41.4 |
| 2013 | 43.22 |
| 2014 | 45.21 |
| 2015 | 46.6 |
| 2016 | 47.84 |
| 2017 | 49.13 |
| 2018 | 50.21 |