Year	Percent change
1980	9.87
1981	17.286
1982	-22.498
1983	3.097
1984	5.626
1985	4.884
1986	38.784
1987	30.28
1988	42.837
1989	-2.743
1990	10.812
1991	10.812
1992	10.812
1993	10.812
1994	5.677
1995	9.813
1996	10.201
1997	21.148
1998	24.791
1999	11.032
2000	-4.329
2001	3.571
2002	5.225
2003	3.707
2004	11.533
2005	10.762
2006	9.045
2007	15.912
2008	3.426
2009	-13.117
2010	8.518
2011	5.97
2012	3.155
2013	4.156
2014	3.886
2015	3.875
2016	3.698
2017	5.529
2018	2.272
2019	4.59
2020	3.925
2021	3.899
2022	3.413
2023	3.244
2024	3.22