Year	Percent change (Units)
1980	-11.591
1981	0.235
1982	-6.598
1983	1.521
1984	14.450
1985	-7.291
1986	36.774
1987	74.268
1988	15.831
1989	-4.298
1991	2.891
1992	11.700
1993	4.390
1994	-2.176
1995	-3.868
1996	-5.623
1997	-8.197
1998	14.287
1999	-0.736
2000	5.658
2001	-2.701
2002	0.862
2003	0.208
2004	12.274
2005	0.214
2006	18.431
2007	17.977
2008	0.196
2009	-23.244
2010	27.659
2011	34.589
2012	-2.017
2013	-12.426
2014	32.216
2015	3.249
2016	122.593
2017	-5.578
2018	19.403
2019	-6.574
2020	60.385
2021	-8.369
2022	-17.528
2023	3.414
2024	14.179
2025	9.433
2026	1.580
2027	5.272
2028	5.822
2029	8.727