| 年度 | 实际值 |
|---|---|
| 1995 | 52.6 |
| 1996 | 53.8 |
| 1997 | 41.47 |
| 1998 | 58 |
| 1999 | 59.5 |
| 2000 | 59.4 |
| 2001 | 59.16 |
| 2002 | 58.35 |
| 2003 | 61.52 |
| 2004 | 61.3 |
| 2005 | 61.03 |
| 2006 | 61.23 |
| 2007 | 61.25 |
| 2008 | 62.95 |
| 2009 | |
| 2010 | 62.45 |
| 2011 | 66.47 |
| 2012 | 62.31 |
| 2013 | 59.89 |
| 2014 | 59.28 |
| 2015 | 56.95 |
| 2016 | 55.27 |
| 2017 | 49.6 |
| 2018 | 47.65 |