Year	Percent change (Units)
1982	4.857
1983	11.249
1984	5.428
1985	17.419
1986	-11.351
1987	-4.133
1988	8.622
1989	10.865
1990	26.115
1991	13.761
1992	15.181
1993	27.681
1994	41.976
1995	18.200
1996	17.015
1997	10.673
1998	4.185
1999	3.346
2000	9.915
2001	12.761
2002	8.250
2003	33.432
2004	17.252
2005	14.783
2006	9.554
2007	5.669
2008	19.097
2009	-2.678
2010	4.253
2011	7.461
2012	4.726
2013	4.306
2014	3.985
2015	8.439
2016	10.668
2017	10.834
2018	13.255
2019	19.675
2020	25.176
2021	13.062
2022	38.656
2023	31.839
2024	22.089
2025	13.410
2026	12.015
2027	10.361
2028	8.000
2029	7.500