| 年度 | 实际值 |
|---|---|
| 1995 | 37.1 |
| 1996 | 38.1 |
| 1997 | 38.93 |
| 1998 | 39.7 |
| 1999 | 40.6 |
| 2000 | 41.2 |
| 2001 | 42.28 |
| 2002 | 42.95 |
| 2003 | 42.09 |
| 2004 | 41.47 |
| 2005 | 44.09 |
| 2006 | 45.1 |
| 2007 | 45.85 |
| 2008 | 46.29 |
| 2009 | |
| 2010 | 48.69 |
| 2011 | 49.27 |
| 2012 | 50.94 |
| 2013 | 52.93 |
| 2014 | 55.25 |
| 2015 | 58.24 |
| 2016 | 60.89 |
| 2017 | |
| 2018 | 63.9 |