Year	Percent change (Units)
1980	-7.733
1981	0.181
1982	53.961
1983	10.432
1984	-12.378
1985	-1.469
1986	-2.389
1987	8.221
1988	-13.433
1989	3.147
1990	17.475
1991	14.112
1992	-6.824
1993	2.972
1994	76.487
1995	14.304
1996	38.648
1997	-6.394
1998	-11.606
1999	12.247
2000	8.339
2001	28.963
2002	1.180
2003	2.458
2004	25.356
2005	20.455
2006	-0.188
2007	28.942
2008	17.859
2009	5.894
2010	-21.448
2011	1.300
2012	16.911
2013	5.272
2014	-5.622
2015	3.926
2016	12.912
2017	10.418
2018	7.464
2019	20.824
2020	5.666
2021	-10.310
2022	-6.655
2023	61.931
2024	2.961
2025	3.049
2026	59.274
2027	-3.651
2028	2.284
2029	1.210