Year	Percent change (Units)
1980	4.096
1981	-3.606
1982	4.926
1983	-1.194
1984	-1.334
1985	7.545
1986	17.189
1987	24.787
1988	16.087
1989	17.712
1990	9.624
1991	10.339
1992	6.823
1993	-5.224
1994	11.447
1995	11.275
1996	8.822
1997	13.272
1998	14.845
1999	13.657
2000	10.822
2001	3.656
2002	3.677
2003	6.038
2004	9.661
2005	6.964
2006	8.214
2007	8.242
2008	-5.508
2009	-18.303
2010	6.198
2011	-0.587
2012	-5.836
2013	-0.215
2014	6.798
2015	5.078
2016	2.650
2017	6.785
2018	3.920
2019	1.288
2020	-15.013
2021	14.917
2022	6.988
2023	0.330
2024	3.252
2025	4.428
2026	3.706
2027	3.721
2028	3.586
2029	3.599