Year	Percent change (Units)
1980	12.663
1981	8.445
1982	4.482
1983	-3.217
1984	1.248
1985	0.480
1986	1.424
1987	0.815
1988	0.682
1989	-2.749
1990	6.215
1991	1.020
1992	2.446
1993	4.583
1994	3.496
1995	3.637
1996	1.872
1997	4.552
1998	2.823
1999	4.205
2000	0.888
2001	3.450
2002	2.033
2003	2.474
2004	1.944
2005	3.403
2006	0.772
2007	3.063
2008	4.956
2009	-0.453
2010	4.000
2011	1.506
2012	2.799
2013	1.054
2014	0.425
2015	1.301
2016	1.066
2017	1.468
2018	1.389
2019	1.370
2020	0.189
2021	2.593
2022	7.721
2023	4.192
2024	2.182
2025	2.059
2026	1.998
2027	1.998
2028	1.998
2029	2.000