| 年度 | 实际值 |
|---|---|
| 1992 | 7.3 |
| 1993 | |
| 1994 | |
| 1995 | 8.2 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 11.6474 |
| 2000 | 12.3254 |
| 2001 | 11.9226 |
| 2002 | 11.9515 |
| 2003 | 12.5194 |
| 2004 | 12.5528 |
| 2005 | 13.3166 |
| 2006 | 12.7738 |
| 2007 | 12.8056 |
| 2008 | 13.3259 |
| 2009 | 13.2025 |
| 2010 | 12.4194 |
| 2011 | 14.84 |
| 2012 | 14.8419 |
| 2013 | 14.2326 |
| 2014 | 14.2546 |
| 2015 | 16.3897 |