Year	Percent change
1980	7.91
1981	5.1
1982	9
1983	10.8
1984	15.2
1985	13.5
1986	8.9
1987	11.7
1988	11.3
1989	4.2
1990	3.9
1991	9.2
1992	14.3
1993	13.9
1994	13.1
1995	11
1996	9.9
1997	9.2
1998	7.8
1999	7.6
2000	8.4
2001	8.3
2002	9.1
2003	10
2004	10.1
2005	11.3
2006	12.7
2007	14.2
2008	9.6
2009	9.2
2010	10.606
2011	9.5
2012	7.9
2013	7.8
2014	7.3
2015	6.9
2016	6.734
2017	6.757
2018	6.567
2019	6.267
2020	6.119
2021	6
2022	5.75
2023	5.6
2024	5.5