Year	Percent change (Units)
1980	4.995
1981	13.589
1982	8.195
1983	7.337
1984	7.616
1985	4.349
1986	7.954
1987	20.229
1988	15.079
1989	6.194
1990	9.098
1991	4.896
1992	2.083
1993	3.192
1994	2.232
1995	6.019
1996	5.971
1997	5.544
1998	6.009
1999	7.087
2000	6.934
2001	7.040
2002	9.516
2003	9.049
2004	6.423
2005	6.069
2006	6.266
2007	11.016
2008	9.886
2009	6.133
2010	9.878
2011	10.018
2012	6.638
2013	3.334
2014	3.705
2015	6.155
2016	7.514
2017	5.855
2018	3.505
2019	4.648
2020	-2.455
2021	-3.293
2022	4.826
2023	4.644
2024	4.295
2025	4.969
2026	5.181
2027	3.570
2028	3.903
2029	5.114