Year	Percent change (Units)
1980	4.444
1981	-0.279
1982	0.595
1983	0.312
1984	2.466
1985	1.652
1986	1.823
1987	2.307
1988	4.723
1989	3.469
1990	3.137
1991	1.833
1992	1.531
1993	-0.962
1994	3.227
1995	2.385
1996	1.321
1997	3.794
1998	1.962
1999	3.543
2000	3.717
2001	1.100
2002	1.707
2003	1.038
2004	3.571
2005	2.322
2006	2.552
2007	3.677
2008	0.447
2009	-2.021
2010	2.865
2011	1.694
2012	0.739
2013	0.459
2014	1.579
2015	2.041
2016	1.267
2017	1.620
2018	1.793
2019	2.241
2020	-5.261
2021	6.851
2022	3.010
2023	1.461
2024	1.158
2025	1.194
2026	1.240
2027	1.225
2028	1.342
2029	1.253