Year	Percent change (Units)
1980	-0.915
1981	-3.403
1982	8.771
1983	-4.360
1984	16.092
1985	10.397
1986	3.625
1987	12.119
1988	7.300
1989	3.291
1990	7.513
1991	12.995
1992	6.300
1993	8.409
1994	7.939
1995	5.580
1996	10.286
1997	11.960
1998	0.220
1999	4.724
2000	11.590
2001	3.054
2002	0.814
2003	-1.089
2004	3.722
2005	3.389
2006	3.423
2007	3.420
2008	4.409
2009	2.007
2010	5.707
2011	-0.136
2012	5.413
2013	5.886
2014	7.025
2015	6.342
2016	6.648
2017	3.419
2018	5.100
2019	3.226
2020	-9.889
2021	-2.213
2022	2.485
2023	6.831
2024	3.027
2025	2.136
2026	1.968
2027	2.026
2028	2.042
2029	2.045