Year	Percent change (Units)
1980	-1.855
1981	6.362
1982	-3.783
1983	10.062
1984	3.346
1985	13.813
1986	3.963
1987	-15.791
1988	22.953
1989	-3.830
1990	3.104
1991	10.500
1992	9.600
1993	4.200
1994	11.684
1995	11.260
1996	-2.123
1997	6.986
1998	-4.737
1999	7.631
2000	2.536
2001	-1.587
2002	0.624
2003	7.210
2004	17.178
2005	7.521
2006	4.992
2007	-1.958
2008	2.990
2009	-1.762
2010	-0.413
2011	3.891
2012	4.815
2013	5.109
2014	6.525
2015	2.867
2016	-0.422
2017	3.270
2018	0.911
2019	7.206
2020	0.970
2021	7.405
2022	4.587
2023	4.523
2024	0.975
2025	1.455
2026	2.308
2027	2.312
2028	2.107
2029	1.930