Year	Percent change (Units)
1980	-64.173
1981	34.900
1982	-15.100
1983	20.500
1984	16.400
1985	1.300
1986	-22.800
1987	8.700
1988	-11.500
1989	-6.400
1990	0.800
1991	-12.300
1992	-9.700
1993	16.000
1994	48.400
1995	25.100
1996	12.100
1997	0.000
1998	0.000
1999	5.856
2000	16.731
2001	21.175
2002	22.074
2003	14.169
2004	2.749
2005	9.723
2006	32.989
2007	19.573
2008	0.737
2009	-10.582
2010	2.477
2011	6.514
2012	3.177
2013	13.524
2014	2.543
2015	-6.597
2016	13.252
2017	-0.065
2018	5.031
2019	16.563
2020	-55.500
2021	-25.436
2022	82.046
2023	14.800
2024	8.136
2025	8.710
2026	9.195
2027	8.215
2028	7.519
2029	8.109