Year	Percent change (Units)
1980	10.183
1981	12.462
1982	10.803
1983	5.816
1984	4.339
1985	3.951
1986	4.174
1987	4.365
1988	4.031
1989	4.984
1990	4.780
1991	5.626
1992	1.490
1993	1.865
1994	0.166
1995	2.149
1996	1.571
1997	1.621
1998	0.996
1999	1.735
2000	2.719
2001	2.525
2002	2.258
2003	2.759
2004	1.857
2005	2.214
2006	2.002
2007	2.138
2008	2.370
2009	0.299
2010	1.777
2011	2.912
2012	1.516
2013	0.938
2014	1.907
2015	1.125
2016	1.429
2017	1.597
2018	2.268
2019	1.949
2020	0.717
2021	3.395
2022	6.803
2023	3.879
2024	2.606
2025	1.854
2026	1.894
2027	1.879
2028	1.917
2029	1.987