Year	Percent change (Units)
1986	-4.100
1987	-5.794
1988	4.365
1989	12.262
1990	9.653
1991	15.260
1992	3.341
1993	-11.400
1994	12.994
1995	9.886
1996	11.743
1997	17.634
1998	-9.770
1999	-20.768
2000	6.000
2001	-1.950
2002	3.320
2003	-23.240
2004	-6.193
2005	-9.508
2006	-2.648
2007	-13.527
2008	13.186
2009	16.112
2010	28.379
2011	43.394
2012	0.672
2013	-0.517
2014	-5.594
2015	22.103
2016	-1.748
2017	-10.557
2018	12.119
2019	-15.284
2020	18.420
2021	6.835
2022	5.792
2023	11.280
2024	2.140
2025	3.653
2026	3.439
2027	4.114
2028	3.846
2029	3.657