Year	Percent change (Units)
1980	-38.309
1981	122.650
1982	72.791
1983	8.355
1984	-5.498
1985	46.863
1986	-8.151
1987	-11.745
1988	28.826
1989	14.879
1990	34.794
1991	17.500
1992	37.300
1993	81.400
1994	24.900
1995	4.300
1996	2.601
1997	-1.416
1998	6.400
1999	1.504
2000	7.193
2001	-17.197
2002	-10.829
2003	-1.570
2004	4.621
2005	14.064
2006	20.741
2007	5.173
2008	15.360
2009	6.900
2010	16.547
2011	27.348
2012	8.019
2013	8.252
2014	27.331
2015	-6.595
2016	20.182
2017	10.325
2018	10.270
2019	5.950
2020	3.964
2021	10.213
2022	-1.770
2023	5.862
2024	1.315
2025	1.368
2026	2.878
2027	3.201
2028	5.529
2029	5.655