Year	Percent change (Units)
1980	0.000
1981	-5.104
1982	8.023
1983	19.674
1984	38.975
1985	-9.048
1986	-27.784
1987	8.431
1988	1.932
1989	-9.295
1990	5.538
1991	5.261
1992	-1.910
1993	-1.201
1994	-23.938
1995	125.542
1996	-18.317
1997	11.595
1998	8.344
1999	2.125
2000	5.394
2001	-4.071
2002	1.466
2003	115.928
2004	198.090
2005	33.570
2006	-4.665
2007	-3.799
2008	-9.179
2009	-0.068
2010	-5.488
2011	-3.052
2012	-8.086
2013	-13.573
2014	5.648
2015	35.821
2016	-14.576
2017	-11.546
2018	12.141
2019	12.518
2020	2.117
2021	-8.334
2022	6.504
2023	10.744
2024	-1.241
2025	4.704
2026	0.469
2027	-0.527
2028	-0.640
2029	-0.669