Year	Percent change (Units)
1982	-33.059
1983	1.909
1984	-8.971
1985	-23.503
1986	12.548
1987	-14.923
1988	11.516
1989	26.517
1990	24.820
1991	13.324
1992	34.779
1993	6.033
1994	-6.888
1995	28.081
1996	17.287
1997	-1.520
1998	-22.984
1999	-4.293
2000	-1.634
2001	-0.704
2002	12.893
2003	-5.247
2004	6.144
2005	5.017
2006	8.937
2007	19.318
2008	30.622
2009	-12.753
2010	3.757
2011	45.065
2012	21.095
2013	14.575
2014	-23.858
2015	-16.099
2016	-11.258
2017	1.371
2018	30.766
2019	12.642
2020	-2.676
2021	30.114
2022	8.590
2023	-12.822
2024	-0.885
2025	2.573
2026	1.865
2027	0.773
2028	2.136
2029	2.257