Year	Percent change (Units)
1980	-0.827
1981	5.070
1982	7.843
1983	-5.326
1984	3.746
1985	3.283
1986	3.113
1987	6.094
1988	-0.592
1989	3.978
1990	-0.676
1991	2.556
1992	1.243
1993	1.311
1994	-0.228
1995	6.093
1996	1.874
1997	2.717
1998	5.972
1999	5.978
2000	3.887
2001	4.311
2002	0.069
2003	5.594
2004	4.643
2005	4.310
2006	2.331
2007	2.827
2008	3.703
2009	2.752
2010	3.391
2011	1.334
2012	4.003
2013	2.412
2014	6.224
2015	6.367
2016	6.356
2017	7.407
2018	6.209
2019	4.614
2020	1.342
2021	6.540
2022	4.000
2023	4.102
2024	8.252
2025	10.189
2026	5.154
2027	5.149
2028	5.298
2029	4.032