| 年度 | 实际值 |
|---|---|
| 1992 | 3.9 |
| 1993 | |
| 1994 | |
| 1995 | 3.5 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 4.6365 |
| 2000 | 4.8254 |
| 2001 | 5.1474 |
| 2002 | 5.4063 |
| 2003 | 6.3148 |
| 2004 | 7.245 |
| 2005 | 7.7174 |
| 2006 | 7.6381 |
| 2007 | 8.3198 |
| 2008 | 8.6101 |
| 2009 | 9.0794 |
| 2010 | 8.7259 |
| 2011 | 10.2295 |
| 2012 | 10.7466 |
| 2013 | 10.5598 |
| 2014 | 10.0613 |
| 2015 | 9.4858 |