Year	Percent change (Units)
1980	10.013
1981	2.505
1982	2.926
1983	3.118
1984	7.937
1985	4.838
1986	0.807
1987	-4.583
1988	16.162
1989	-0.083
1990	5.332
1991	-2.086
1992	-7.912
1993	13.409
1994	0.443
1995	-44.223
1996	17.109
1997	12.785
1998	10.499
1999	11.246
2000	-1.799
2001	7.962
2002	-7.030
2003	-5.441
2004	10.116
2005	16.678
2006	15.298
2007	11.262
2008	22.666
2009	-3.058
2010	-7.107
2011	-3.197
2012	3.431
2013	1.230
2014	3.876
2015	19.339
2016	5.358
2017	1.206
2018	-0.175
2019	3.334
2020	-0.066
2021	-3.564
2022	6.343
2023	-17.475
2024	6.923
2025	-0.586
2026	12.589
2027	12.115
2028	11.803
2029	9.923