Year	Percent change (Units)
1980	5.227
1981	5.063
1982	1.591
1983	3.638
1984	6.334
1985	7.100
1986	-2.348
1987	3.101
1988	10.200
1989	10.544
1990	8.572
1991	2.937
1992	1.319
1993	-2.373
1994	5.688
1995	7.205
1996	9.979
1997	11.028
1998	7.852
1999	6.434
2000	13.525
2001	5.771
2002	4.286
2003	0.531
2004	8.661
2005	6.665
2006	7.576
2007	7.572
2008	2.171
2009	-14.368
2010	13.131
2011	5.935
2012	1.438
2013	0.641
2014	2.888
2015	3.049
2016	2.988
2017	4.898
2018	5.198
2019	4.060
2020	-10.570
2021	9.127
2022	11.187
2023	1.775
2024	1.804
2025	2.986
2026	2.984
2027	2.530
2028	2.389
2029	2.453