| 年度 | 实际值 |
|---|---|
| 1995 | 43.4 |
| 1996 | 45.6 |
| 1997 | 48.18 |
| 1998 | 51 |
| 1999 | 49.8 |
| 2000 | 51.6 |
| 2001 | 50.85 |
| 2002 | 51.1 |
| 2003 | 48.54 |
| 2004 | 47.97 |
| 2005 | 50.62 |
| 2006 | 50.73 |
| 2007 | 52.73 |
| 2008 | 53.82 |
| 2009 | |
| 2010 | 59.64 |
| 2011 | 58.33 |
| 2012 | 60.72 |
| 2013 | 62.33 |
| 2014 | 64.9 |
| 2015 | 67.82 |
| 2016 | 69.78 |
| 2017 | 69.18 |
| 2018 | 69.9 |