Year	Percent change
1980	4.995
1981	13.589
1982	8.195
1983	7.337
1984	7.616
1985	4.349
1986	7.954
1987	20.229
1988	15.079
1989	6.194
1990	9.098
1991	4.896
1992	2.083
1993	3.192
1994	2.232
1995	6.019
1996	5.971
1997	5.544
1998	6.009
1999	7.087
2000	6.934
2001	7.04
2002	9.516
2003	9.118
2004	6.748
2005	6.527
2006	6.981
2007	12.571
2008	10.752
2009	5.722
2010	9.327
2011	9.72
2012	6.428
2013	3.57
2014	3.963
2015	6.183
2016	7.316
2017	7.382
2018	5.782
2019	4.816
2020	6.335
2021	6.016
2022	7.211
2023	7.467
2024	6.521