| 年度 | 实际值 |
|---|---|
| 1992 | 1.7 |
| 1993 | |
| 1994 | |
| 1995 | 1.5 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 1.7115 |
| 2000 | 1.734 |
| 2001 | 1.7391 |
| 2002 | 1.7672 |
| 2003 | 1.7568 |
| 2004 | 1.7489 |
| 2005 | 1.7648 |
| 2006 | 1.5733 |
| 2007 | 1.6722 |
| 2008 | 1.5124 |
| 2009 | 1.3901 |
| 2010 | 1.5724 |
| 2011 | 1.573 |
| 2012 | 1.5898 |
| 2013 | 1.6414 |
| 2014 | 1.5942 |
| 2015 | 1.5954 |