Year	Percent change (Units)
1980	-8.265
1981	16.790
1982	4.907
1983	2.457
1984	-6.029
1985	12.320
1986	-3.551
1987	-6.972
1988	-6.324
1989	9.688
1990	5.024
1991	2.181
1992	-16.937
1993	-3.382
1994	-8.591
1995	14.358
1996	-2.870
1997	-10.242
1998	19.570
1999	-3.245
2000	-14.231
2001	6.702
2002	14.821
2003	25.707
2004	17.287
2005	2.516
2006	-0.203
2007	24.210
2008	31.046
2009	-6.888
2010	-6.881
2011	10.820
2012	3.810
2013	5.609
2014	4.541
2015	-2.501
2016	2.070
2017	22.318
2018	13.343
2019	0.253
2020	11.549
2021	7.263
2022	1.051
2023	7.202
2024	4.087
2025	7.955
2026	7.975
2027	6.870
2028	7.626
2029	6.636