Year	Percent change (Units)
1980	9.408
1981	12.493
1982	10.528
1983	6.208
1984	12.448
1985	7.729
1986	8.734
1987	2.699
1988	2.369
1989	3.138
1990	6.026
1991	7.940
1992	5.779
1993	5.298
1994	5.031
1995	6.287
1996	2.817
1997	1.096
1998	2.710
1999	0.792
2000	1.832
2001	0.643
2002	2.810
2003	1.118
2004	1.474
2005	1.090
2006	3.234
2007	1.972
2008	3.754
2009	-0.219
2010	0.989
2011	0.979
2012	1.293
2013	1.809
2014	0.522
2015	1.559
2016	1.535
2017	0.806
2018	1.600
2019	0.197
2020	0.688
2021	1.366
2022	6.641
2023	6.137
2024	2.158
2025	2.530
2026	2.396
2027	2.204
2028	2.092
2029	2.008