Year	Percent change (Units)
1980	-17.413
1981	6.488
1982	-3.596
1983	-7.643
1984	31.382
1985	-17.431
1986	-38.691
1987	34.760
1988	7.995
1989	-11.331
1990	-16.368
1991	-2.119
1992	4.100
1993	0.600
1995	12.900
1996	-3.200
1997	10.000
1998	-2.500
1999	-5.800
2000	15.068
2001	17.565
2002	18.342
2003	13.253
2004	39.497
2005	11.569
2006	8.644
2007	42.525
2008	3.473
2009	-12.111
2010	22.889
2011	19.856
2012	3.020
2013	11.828
2014	1.357
2015	6.726
2016	7.946
2017	8.269
2018	0.111
2019	3.180
2020	-4.405
2021	7.497
2022	8.791
2023	-1.098
2024	3.549
2025	3.671
2026	3.432
2027	3.123
2028	3.004
2029	2.926