Year	Percent change (Units)
1980	9.689
1981	13.227
1982	6.710
1983	12.538
1984	7.540
1985	9.464
1986	4.380
1987	2.398
1988	1.543
1989	5.608
1990	7.543
1991	8.177
1992	3.895
1993	5.949
1994	5.692
1995	4.148
1996	3.913
1997	1.513
1998	2.219
1999	0.907
2000	1.670
2001	1.706
2002	1.429
2003	1.776
2004	0.542
2005	2.095
2006	3.283
2007	1.986
2008	4.229
2009	-1.614
2010	2.220
2011	0.869
2012	2.583
2013	0.420
2014	1.672
2015	0.617
2016	1.736
2017	1.606
2018	0.198
2019	1.085
2020	-0.293
2021	3.229
2022	8.341
2023	3.412
2024	2.544
2025	2.211
2026	2.260
2027	2.171
2028	2.091
2029	1.997