Year	Percent change
1980	10.004
1981	15.332
1982	4.715
1983	3
1984	6.438
1985	9.122
1986	4.829
1987	-0.96
1988	-2.1
1989	9.893
1990	6.686
1991	3.999
1992	6.999
1993	5.867
1994	8.16
1995	7.045
1996	6.892
1997	6.907
1998	4.279
1999	4.028
2000	6.429
2001	4.772
2002	6.809
2003	6.179
2004	7.187
2005	6.94
2006	8.954
2007	7.851
2008	7.822
2009	7.373
2010	8.018
2011	7.986
2012	7.805
2013	8.026
2014	7.612
2015	7.27
2016	7.023
2017	6.832
2018	6.5
2019	6.72
2020	6.821
2021	6.781
2022	6.775
2023	6.754
2024	6.76