| Time | 1987-1991 | 1991-1993 | 1993-1996 | 1996-1999 | 1999-2001 | 2001-2005 | 
| AGR | 15.9% | 14.8% | 2.1% | 1.7% | 3.0% | 12.4% | 
| Time | 2005-2008 | 2008-2011 | 2011-2014 | 2014-2017 | Average | 
 | 
| AGR | 3.1% | 2.4% | 6.8% | 9.6% | 7.2% | 
 |