Year	Percent change (Units)
1980	7.301
1981	1.912
1982	-17.767
1983	3.160
1984	11.672
1985	0.933
1986	-6.630
1987	-3.269
1988	-9.832
1989	16.237
1990	104.529
1991	-5.400
1992	13.100
1993	14.600
1994	5.800
1995	30.849
1996	2.520
1997	7.300
1998	18.600
1999	-0.400
2000	29.533
2001	28.322
2002	11.390
2003	20.094
2004	26.766
2005	19.078
2006	28.773
2007	44.443
2008	9.013
2009	-25.668
2010	18.303
2011	9.418
2012	-2.842
2013	7.369
2014	9.826
2015	8.379
2016	17.578
2017	9.433
2018	7.147
2019	6.750
2020	-1.164
2021	12.588
2022	7.701
2023	-1.400
2024	5.722
2025	6.858
2026	6.142
2027	4.831
2028	4.671
2029	4.199