Year	Percent change (Units)
1980	-0.516
1981	-0.605
1982	0.867
1983	1.770
1984	6.437
1985	5.654
1986	3.974
1987	6.359
1988	0.892
1989	4.584
1990	5.165
1991	-0.212
1992	4.317
1993	4.296
1994	8.940
1995	9.009
1996	7.101
1997	12.312
1998	3.017
1999	3.496
2000	9.758
2001	2.888
2002	0.921
2003	1.707
2004	5.038
2005	7.556
2006	12.721
2007	-1.566
2008	2.733
2009	-8.840
2010	6.545
2011	6.928
2012	0.760
2013	0.285
2014	1.005
2015	3.773
2016	2.774
2017	6.766
2018	3.086
2019	1.997
2020	-11.470
2021	4.941
2022	8.970
2023	-1.360
2024	-1.161
2025	0.717
2026	1.388
2027	1.918
2028	1.567
2029	1.499