Year	Percent change (Units)
1980	3.099
1981	-1.234
1982	0.414
1983	1.169
1984	3.226
1985	2.798
1986	2.860
1987	3.192
1988	4.194
1989	3.389
1990	2.053
1991	1.435
1992	0.834
1993	-0.853
1994	2.151
1995	2.887
1996	1.197
1997	1.830
1998	1.811
1999	1.626
2000	3.787
2001	1.951
2002	0.254
2003	0.139
2004	1.424
2005	0.818
2006	1.791
2007	1.487
2008	-0.962
2009	-5.281
2010	1.713
2011	0.707
2012	-2.981
2013	-1.841
2014	-0.005
2015	0.778
2016	1.293
2017	1.668
2018	0.926
2019	0.483
2020	-8.974
2021	8.310
2022	3.986
2023	0.921
2024	0.709
2025	0.714
2026	0.170
2027	0.320
2028	0.752
2029	0.834