Year	Percent change (Units)
1987	-31.248
1988	23.000
1989	63.800
1990	141.800
1991	191.000
1992	75.000
1993	114.319
1994	10.440
1995	10.077
1996	7.147
1997	10.503
1998	12.899
1999	1.996
2000	-0.826
2001	-0.117
2002	-0.036
2003	1.027
2004	3.925
2005	6.349
2006	6.143
2007	7.668
2008	24.997
2009	-0.663
2010	3.997
2011	5.480
2012	2.933
2013	2.944
2014	3.853
2015	1.215
2016	3.035
2017	2.906
2018	2.460
2019	1.944
2020	2.938
2021	2.921
2022	5.327
2023	2.143
2024	2.268
2025	3.040
2026	3.040
2027	3.000
2028	3.000
2029	3.000