Year	Percent change (Units)
1980	-2.320
1981	8.341
1982	3.780
1983	-2.978
1984	9.681
1985	6.145
1986	4.566
1987	1.700
1988	7.697
1989	4.328
1990	4.635
1991	6.366
1992	4.108
1993	3.847
1994	8.219
1995	3.468
1996	5.338
1997	5.261
1998	2.943
1999	4.483
2000	6.116
2001	5.629
2002	0.120
2003	3.945
2004	4.683
2005	3.479
2006	3.365
2007	3.412
2008	6.105
2009	4.533
2010	4.816
2011	3.422
2012	4.670
2013	3.525
2014	6.011
2015	3.976
2016	0.433
2017	8.977
2018	7.622
2019	6.657
2020	-2.370
2021	4.838
2022	5.613
2023	0.832
2024	3.104
2025	5.191
2026	5.185
2027	5.206
2028	5.228
2029	5.249