Year	Percent change (Units)
1980	-7.963
1981	13.385
1982	4.648
1983	8.633
1984	17.383
1985	10.233
1986	-6.404
1987	4.043
1988	19.896
1989	-6.746
1990	18.704
1991	-4.347
1992	3.083
1993	0.876
1994	-0.012
1995	-4.582
1996	7.456
1997	2.467
1998	5.212
1999	11.197
2000	5.882
2001	15.466
2002	39.426
2003	-2.500
2004	9.117
2005	2.930
2006	6.479
2007	12.064
2008	-3.188
2009	-6.305
2010	16.955
2011	2.870
2012	7.830
2013	5.650
2014	-0.189
2015	6.268
2016	8.248
2017	10.580
2018	2.058
2019	4.211
2020	-16.858
2021	6.881
2022	29.864
2023	-0.818
2024	2.756
2025	3.649
2026	4.040
2027	3.278
2028	3.062
2029	4.013