Year	Percent change (Units)
1980	9.000
1981	8.800
1982	-2.100
1983	7.200
1984	7.200
1985	27.900
1986	21.500
1987	9.300
1988	12.300
1989	20.200
1990	59.800
1991	10.032
1992	14.220
1993	11.644
1994	11.610
1995	8.607
1996	10.849
1997	7.149
1998	7.466
1999	4.915
2000	5.072
2001	8.917
2002	6.310
2003	5.877
2004	9.215
2005	8.563
2006	5.789
2007	8.764
2008	9.401
2009	-0.293
2010	5.402
2011	6.206
2012	3.431
2013	4.396
2014	2.949
2015	3.057
2016	4.241
2017	5.677
2018	2.315
2019	3.407
2020	4.819
2021	3.061
2022	9.241
2023	4.178
2024	4.000
2025	4.033
2026	3.975
2027	4.033
2028	4.033
2029	4.033