Year	Percent change (Units)
1980	1.809
1981	1.069
1982	2.505
1983	1.241
1984	1.514
1985	1.623
1986	2.337
1987	2.562
1988	4.743
1989	4.344
1990	2.924
1991	1.048
1992	1.599
1993	-0.629
1994	2.358
1995	2.107
1996	1.413
1997	2.336
1998	3.589
1999	3.421
2000	3.924
2001	1.984
2002	1.136
2003	0.823
2004	2.830
2005	1.663
2006	2.449
2007	2.425
2008	0.255
2009	-2.873
2010	1.949
2011	2.193
2012	0.313
2013	0.576
2014	0.956
2015	1.113
2016	1.095
2017	2.291
2018	1.865
2019	1.843
2020	-7.540
2021	6.321
2022	2.526
2023	0.869
2024	0.744
2025	1.442
2026	1.568
2027	1.464
2028	1.446
2029	1.343