Year	Percent change (Units)
1980	6.912
1981	6.208
1982	7.562
1983	6.788
1984	3.973
1985	8.708
1986	6.363
1987	5.811
1988	6.436
1989	4.808
1990	4.589
1991	5.127
1992	7.569
1993	2.097
1994	4.369
1995	5.062
1996	6.599
1997	1.703
1998	3.494
1999	4.182
2000	3.908
2001	3.638
2002	2.623
2003	5.167
2004	7.691
2005	7.997
2006	5.664
2007	5.111
2008	4.445
2009	1.063
2010	2.265
2011	3.204
2012	3.196
2013	3.856
2014	3.556
2015	3.812
2016	4.072
2017	4.609
2018	6.096
2019	3.120
2020	-0.943
2021	5.770
2022	6.169
2023	-0.166
2024	2.000
2025	3.500
2026	4.500
2027	5.000
2028	5.000
2029	5.000