Year	Percent change (Units)
1980	7.945
1981	6.212
1982	-13.588
1983	-2.802
1984	5.886
1985	1.968
1986	5.596
1987	6.581
1988	7.288
1989	10.605
1990	3.671
1991	7.804
1992	11.167
1993	6.589
1994	5.030
1995	8.933
1996	4.985
1997	7.392
1998	4.181
1999	-0.274
2000	4.972
2001	3.154
2002	3.203
2003	4.723
2004	6.674
2005	5.837
2006	6.050
2007	5.168
2008	3.789
2009	-1.118
2010	5.852
2011	6.224
2012	6.155
2013	3.309
2014	1.793
2015	2.152
2016	1.753
2017	1.358
2018	3.990
2019	0.634
2020	-6.143
2021	11.334
2022	2.059
2023	0.219
2024	1.983
2025	2.534
2026	2.355
2027	2.346
2028	2.297
2029	2.320