Year	Percent change (Units)
1980	22.100
1981	1.779
1982	11.217
1983	-23.348
1984	-14.085
1985	-19.046
1986	28.654
1987	7.591
1988	11.508
1989	5.349
1990	4.688
1991	1.925
1992	-4.188
1993	14.576
1994	3.922
1995	-33.196
1996	3.490
1997	2.895
1998	16.686
1999	47.711
2000	-9.417
2001	-3.792
2002	50.442
2003	4.741
2004	0.891
2005	10.153
2006	10.723
2007	-3.031
2008	10.130
2009	5.504
2010	-6.922
2011	36.165
2012	47.812
2013	18.773
2014	-1.469
2015	1.864
2016	-33.723
2017	5.679
2018	11.608
2019	10.643
2020	-8.888
2021	8.986
2022	48.909
2023	-27.679
2024	23.830
2025	-0.045
2026	4.069
2027	0.667
2028	-0.719
2029	-0.761