Year	Percent change (Units)
1980	-2.076
1981	0.562
1982	-8.884
1983	-11.497
1984	2.134
1985	0.366
1986	-0.234
1987	-0.130
1988	-5.981
1989	-4.944
1990	-3.010
1991	6.026
1992	7.758
1993	8.201
1994	8.482
1995	5.055
1996	7.956
1997	6.185
1998	-1.707
1999	2.986
2000	-1.345
2001	2.260
2002	1.149
2003	-0.652
2004	1.566
2005	-1.942
2006	5.127
2007	7.020
2008	1.977
2009	3.319
2010	4.371
2011	5.437
2012	5.039
2013	3.653
2014	1.686
2015	0.687
2016	3.807
2017	3.734
2018	4.441
2019	5.353
2020	43.480
2021	20.060
2022	62.288
2023	32.963
2024	33.895
2025	18.716
2026	21.058
2027	21.055
2028	13.486
2029	11.930