Year	Percent change (Units)
1980	5.730
1981	4.609
1982	-2.955
1983	2.113
1984	13.912
1985	10.014
1986	5.556
1987	10.237
1988	-1.472
1989	3.992
1990	2.102
1991	-2.560
1992	14.081
1993	9.941
1994	13.239
1995	9.692
1996	6.102
1997	9.077
1998	6.219
1999	14.446
2000	23.398
2001	-11.672
2002	-2.080
2003	8.100
2004	17.520
2005	4.673
2006	5.083
2007	10.225
2008	5.658
2009	-12.047
2010	14.858
2011	8.259
2012	-0.460
2013	5.065
2014	0.872
2015	-1.734
2016	2.407
2017	4.877
2018	5.598
2019	2.903
2020	-2.434
2021	14.931
2022	8.636
2023	-0.570
2024	-0.230
2025	7.422
2026	4.613
2027	3.900
2028	4.000
2029	4.200