Year	Percent change (Units)
1980	-4.286
1981	2.531
1982	-17.489
1983	11.834
1984	20.590
1985	9.229
1986	6.947
1987	5.330
1988	13.296
1989	4.628
1990	0.321
1991	2.222
1992	6.229
1993	8.579
1994	10.715
1995	7.137
1996	5.350
1997	16.733
1998	6.183
1999	8.651
2000	8.852
2001	-5.243
2002	1.692
2003	3.396
2004	8.596
2005	7.528
2006	5.427
2007	5.450
2008	0.321
2009	-14.310
2010	13.987
2011	5.877
2012	3.312
2013	2.421
2014	2.539
2015	0.280
2016	-0.244
2017	5.089
2018	2.936
2019	-0.780
2020	-6.980
2021	8.764
2022	5.729
2023	-0.771
2024	1.212
2025	3.962
2026	4.205
2027	4.555
2028	4.536
2029	4.503