| 年度 | 实际值 |
|---|---|
| 1995 | 47.9 |
| 1996 | 22 |
| 1997 | 22.09 |
| 1998 | 13.7 |
| 1999 | 13.48 |
| 2000 | 9.3 |
| 2001 | 8.5 |
| 2002 | 8.2 |
| 2003 | 11.3 |
| 2004 | 7.7 |
| 2005 | 11.3 |
| 2006 | 15.1 |
| 2007 | 17.85073456 |
| 2008 | 15.1416070592695 |
| 2009 | 16.6 |
| 2010 | 20.2 |
| 2011 | 9.87575919983065 |
| 2012 | 7.93570418100052 |
| 2013 | 142.9 |
| 2014 | 11.3 |
| 2015 | 8.5777197803302 |
| 2016 | |
| 2017 | 4.77 |
| 2018 | 5.45 |