Year	Percent change (Units)
1980	3.305
1981	4.618
1982	-2.483
1983	4.507
1984	6.791
1985	3.025
1986	-0.149
1987	4.251
1988	8.954
1989	10.033
1990	4.869
1991	6.230
1992	4.856
1993	0.107
1994	9.905
1995	9.945
1996	3.072
1997	12.981
1998	8.760
1999	4.505
2000	12.961
2001	2.880
2002	2.053
2003	-0.281
2004	4.825
2005	3.853
2006	7.006
2007	1.279
2008	-0.469
2009	-12.406
2010	9.611
2011	5.775
2012	1.743
2013	1.358
2014	1.689
2015	4.457
2016	1.542
2017	5.349
2018	3.981
2019	1.802
2020	-15.338
2021	9.202
2022	2.893
2023	1.162
2024	2.580
2025	3.487
2026	3.561
2027	3.366
2028	3.403
2029	3.230