Year	Percent change (Units)
1980	7.115
1981	-1.618
1982	-3.463
1983	6.575
1984	10.972
1985	6.555
1986	-3.581
1987	3.510
1988	10.400
1989	10.262
1990	8.615
1991	5.988
1992	1.348
1993	-4.615
1994	10.391
1995	5.556
1996	5.846
1997	8.936
1998	7.261
1999	5.779
2000	11.354
2001	4.906
2002	-0.038
2003	3.782
2004	9.192
2005	5.020
2006	6.280
2007	7.117
2008	0.943
2009	-12.532
2010	14.337
2011	6.297
2012	-0.045
2013	-1.954
2014	2.147
2015	4.169
2016	3.625
2017	4.284
2018	4.156
2019	0.472
2020	-7.152
2021	15.179
2022	5.129
2023	-2.427
2024	2.105
2025	1.958
2026	3.820
2027	2.435
2028	2.604
2029	2.368