Year	Percent change (Units)
1980	2.800
1981	-3.514
1982	-11.915
1983	1.510
1984	-19.118
1985	-23.877
1986	48.191
1987	34.989
1988	8.215
1989	2.769
1990	2.035
1991	9.743
1992	9.690
1993	5.224
1994	8.637
1995	5.053
1996	-6.207
1997	15.948
1998	12.751
1999	2.705
2000	23.913
2001	7.560
2002	56.038
2003	8.782
2004	-12.105
2005	-16.599
2006	6.180
2007	12.144
2008	-11.574
2009	-6.421
2010	6.588
2011	-24.030
2012	10.970
2013	2.003
2014	10.806
2015	-0.987
2016	3.827
2017	3.965
2018	-2.808
2019	16.283
2020	-2.401
2021	8.831
2022	-0.427
2023	10.035
2024	1.198
2025	3.634
2026	1.736
2027	1.804
2028	0.905
2029	3.772