Year	Percent change (Units)
1980	0.000
1981	0.000
1982	5.065
1983	-2.542
1984	-2.461
1985	-2.834
1986	18.857
1987	-17.526
1988	10.722
1989	-8.967
1990	-8.409
1991	31.851
1992	-0.968
1993	5.785
1994	1.190
1995	3.028
1996	-8.444
1997	8.470
1998	4.347
1999	-2.663
2000	-2.287
2001	8.475
2002	-0.289
2003	3.154
2004	-12.389
2005	-13.002
2006	1.533
2007	-8.768
2008	2.320
2009	5.484
2010	-4.656
2011	6.962
2012	3.067
2013	-7.307
2014	1.529
2015	4.303
2016	-7.561
2017	-7.090
2018	-8.626
2019	24.303
2020	33.322
2021	1.526
2022	-7.700
2023	-4.892
2024	1.970
2025	10.297
2026	7.371
2027	3.156
2028	5.392
2029	4.822