Year	Percent change
1980	21.127
1981	26.904
1982	12.297
1983	5.298
1984	-8.739
1985	-1.145
1986	32.055
1987	19.798
1988	2.085
1989	20.871
1990	7.845
1991	9.36
1992	17.503
1993	12.021
1994	17.956
1995	8.945
1996	8.806
1997	28.843
1998	12.858
1999	7.695
2000	4.92
2001	5.268
2002	3.029
2003	8.096
2004	7.933
2005	13.66
2006	14.517
2007	13.391
2008	6.935
2009	10.225
2010	17.535
2011	12.509
2012	5.86
2013	14.296
2014	7.581
2015	9.224
2016	11.034
2017	3.396
2018	8.962
2019	8.07
2020	5.754
2021	6.565
2022	6.71
2023	7.237
2024	7.046