Year	Percent change (Units)
1980	12.819
1981	-3.406
1982	14.832
1983	1.704
1984	-0.710
1985	17.253
1986	10.569
1987	5.725
1988	5.404
1989	14.440
1990	5.700
1991	9.600
1992	13.900
1993	3.700
1994	9.800
1995	11.500
1996	11.995
1997	11.026
1998	7.820
1999	5.841
2000	4.882
2001	8.384
2002	0.800
2003	5.875
2004	14.881
2005	2.324
2006	3.786
2007	6.624
2008	-1.888
2009	-3.124
2010	0.317
2011	4.363
2012	2.063
2013	3.692
2014	1.729
2015	-1.902
2016	0.484
2017	-1.864
2018	5.896
2019	-2.241
2020	2.876
2021	-1.056
2022	-1.504
2023	-1.125
2024	5.954
2025	5.009
2026	2.727
2027	2.386
2028	2.186
2029	1.982