Year	Percent change (Units)
1986	-2.715
1987	2.009
1988	1.097
1989	-1.074
1990	1.089
1991	3.146
1992	4.759
1993	0.305
1994	3.145
1995	4.479
1996	2.878
1997	-1.471
1998	-0.559
1999	3.052
2000	2.849
2001	2.744
2002	3.872
2003	2.904
2004	0.504
2005	0.388
2006	4.398
2007	0.154
2008	-1.939
2009	-1.765
2010	2.599
2011	3.744
2012	0.913
2013	-2.125
2014	-2.508
2015	-0.405
2016	-2.465
2017	1.329
2018	0.052
2019	3.869
2020	1.134
2021	-1.591
2022	-1.628
2023	1.407
2024	2.385
2025	2.519
2026	2.918
2027	3.055
2028	3.060
2029	3.080