Year	Percent change (Units)
1980	-6.757
1981	-9.505
1982	-12.680
1983	-4.117
1984	4.459
1985	-1.820
1986	-2.272
1987	4.288
1988	7.609
1989	14.746
1990	47.000
1991	-2.604
1992	5.250
1993	17.629
1994	-1.685
1995	11.329
1996	13.348
1997	14.474
1998	-8.593
1999	3.721
2000	21.257
2001	3.460
2002	7.145
2003	20.530
2004	20.497
2005	14.535
2006	11.823
2007	15.671
2008	18.066
2009	-11.843
2010	3.503
2011	19.095
2012	17.779
2013	8.185
2014	-4.318
2015	1.229
2016	3.961
2017	0.700
2018	-4.495
2019	-1.395
2020	-8.412
2021	-0.743
2022	6.830
2023	9.319
2024	1.505
2025	3.341
2026	3.678
2027	4.012
2028	4.175
2029	4.562