Year	Percent change (Units)
1980	7.550
1981	-1.184
1982	6.044
1983	-6.253
1984	6.160
1985	10.734
1986	13.431
1987	-6.683
1988	-3.680
1989	1.220
1990	3.427
1991	-1.991
1992	-0.045
1993	5.348
1994	8.573
1995	9.058
1996	12.224
1997	10.838
1998	10.483
1999	-4.091
2000	2.341
2001	0.719
2002	1.148
2003	3.072
2004	12.127
2005	8.040
2006	10.617
2007	9.093
2008	4.569
2009	-11.667
2010	6.788
2011	4.552
2012	-0.091
2013	4.066
2014	1.860
2015	2.751
2016	0.239
2017	2.570
2018	2.266
2019	5.216
2020	-2.113
2021	3.862
2022	0.882
2023	-3.386
2024	0.975
2025	1.571
2026	1.871
2027	1.887
2028	1.817
2029	1.762