| 年度 | 实际值 |
|---|---|
| 1992 | 17.13 |
| 1993 | 30.86 |
| 1994 | 31.27 |
| 1995 | 31.65 |
| 1996 | 32.24 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 34.3 |
| 2001 | 35.11 |
| 2002 | 35.77 |
| 2003 | 36.12 |
| 2004 | 36.73 |
| 2005 | 37.22 |
| 2006 | 37.72 |
| 2007 | 38.45 |
| 2008 | 39.01 |
| 2009 | |
| 2010 | 39.48 |
| 2011 | 40.4 |
| 2012 | 40.9 |
| 2013 | 41.3 |
| 2014 | 42 |
| 2015 | 138.56 |
| 2016 | 140 |
| 2017 | 141 |
| 2018 | 142 |