Year	Percent change (Units)
1980	2.387
1981	-4.419
1982	3.265
1983	-2.994
1984	2.554
1985	5.883
1986	6.643
1987	8.568
1988	10.838
1989	9.745
1990	4.738
1991	3.505
1992	0.951
1993	-4.456
1994	10.868
1995	8.441
1996	0.607
1997	7.683
1998	12.046
1999	7.037
2000	16.973
2001	0.863
2002	2.291
2003	0.976
2004	6.539
2005	7.169
2006	6.287
2007	5.208
2008	1.011
2009	-10.703
2010	8.481
2011	6.292
2012	-0.693
2013	0.801
2014	2.748
2015	5.001
2016	3.079
2017	5.998
2018	2.312
2019	2.317
2020	-10.942
2021	8.787
2022	6.182
2023	-2.311
2024	0.399
2025	2.365
2026	2.492
2027	2.682
2028	2.815
2029	2.634