Year	Percent change (Units)
1980	11.572
1981	-8.194
1982	8.080
1983	7.196
1984	16.277
1985	-7.078
1986	-16.085
1987	-14.016
1988	4.412
1989	12.884
1990	4.042
1991	16.467
1992	-8.490
1993	0.909
1994	9.339
1995	2.346
1996	7.454
1997	6.939
1998	4.092
1999	6.017
2000	6.867
2001	-2.433
2002	-2.375
2003	9.725
2004	2.516
2005	19.824
2006	3.792
2007	6.982
2008	-4.811
2009	-13.309
2010	4.030
2011	-7.647
2012	-6.483
2013	2.805
2014	-2.946
2015	8.528
2016	11.429
2017	0.212
2018	-1.699
2019	6.823
2020	-36.546
2021	-2.653
2022	21.449
2023	14.898
2024	11.384
2025	4.964
2026	4.364
2027	3.627
2028	3.347
2029	3.304