Year	Percent change (Units)
1980	5.580
1981	8.661
1982	3.165
1983	4.596
1984	3.298
1985	6.037
1986	1.339
1987	4.857
1988	9.142
1989	4.658
1990	6.527
1991	6.169
1992	0.271
1993	1.229
1994	8.236
1995	2.883
1996	4.650
1997	4.488
1998	4.101
1999	11.270
2000	12.578
2001	3.353
2002	4.358
2003	-1.202
2004	3.015
2005	7.729
2006	10.338
2007	3.654
2008	3.872
2009	-9.224
2010	2.940
2011	7.195
2012	1.162
2013	1.611
2014	3.129
2015	3.577
2016	4.111
2017	4.814
2018	3.352
2019	4.511
2020	-6.105
2021	7.671
2022	10.843
2023	12.538
2024	9.230
2025	2.000
2026	1.900
2027	1.828
2028	1.828
2029	1.828