Year	Percent change (Units)
1980	-8.878
1981	55.946
1982	-36.071
1983	25.226
1984	75.304
1985	-21.217
1986	1.981
1987	-2.986
1988	19.542
1989	8.651
1990	12.295
1991	1.136
1992	-2.961
1993	-9.840
1994	-60.358
1996	-2.731
1997	28.810
1998	3.337
1999	-30.732
2000	5.456
2001	-7.689
2002	-2.996
2003	165.253
2004	224.805
2005	34.094
2006	-5.699
2007	-5.028
2008	-9.215
2009	-8.833
2010	-0.742
2011	-1.843
2012	-8.318
2013	-14.616
2014	5.540
2015	38.503
2016	-14.220
2017	-11.392
2018	13.518
2019	12.688
2020	-0.592
2021	-6.264
2022	9.401
2023	7.041
2024	-1.130
2025	4.831
2026	0.193
2027	-0.831
2028	-0.825
2029	-0.817