Year	Percent change (Units)
1980	-1.141
1981	0.200
1982	-4.067
1983	0.987
1984	0.977
1985	7.527
1986	2.600
1987	2.242
1988	-0.191
1989	0.955
1990	-5.203
1991	55.523
1992	13.343
1993	12.909
1994	-5.040
1995	17.162
1996	10.753
1997	24.288
1998	30.488
1999	0.281
2000	12.720
2001	16.350
2002	7.789
2003	20.277
2004	25.276
2005	24.869
2006	10.160
2007	8.576
2008	-2.441
2009	-20.449
2010	6.868
2011	-0.402
2012	-2.741
2013	2.434
2014	10.117
2015	15.195
2016	6.078
2017	8.030
2018	4.153
2019	5.882
2020	-1.814
2021	-0.188
2022	19.680
2023	-5.962
2024	4.610
2025	5.750
2026	5.392
2027	5.289
2028	5.817
2029	5.298