Year	Percent change (Units)
1980	13.728
1981	13.892
1982	9.691
1983	9.292
1984	6.690
1985	4.703
1986	2.121
1987	3.115
1988	3.081
1989	3.563
1990	3.212
1991	3.264
1992	2.010
1993	2.227
1994	1.439
1995	2.107
1996	1.699
1997	1.140
1998	0.236
1999	1.360
2000	1.806
2001	1.496
2002	2.185
2003	2.407
2004	2.243
2005	1.727
2006	1.675
2007	2.787
2008	1.164
2009	0.988
2010	1.988
2011	2.634
2012	1.519
2013	0.839
2014	0.110
2015	0.290
2016	0.829
2017	1.278
2018	1.937
2019	1.670
2020	-0.227
2021	3.371
2022	6.991
2023	4.185
2024	1.829
2025	1.942
2026	1.725
2027	2.011
2028	1.584
2029	1.984