Year	Percent change (Units)
1989	69.626
1990	64.325
1991	4027.829
1992	79.416
1993	63.800
1994	121.900
1995	32.900
1996	310.800
1997	549.206
1998	1.633
1999	6.970
2000	11.256
2001	4.822
2002	3.814
2003	5.640
2004	3.966
2005	7.394
2006	6.093
2007	11.563
2008	7.191
2009	1.637
2010	4.450
2011	2.039
2012	2.763
2013	-0.851
2014	-1.951
2015	-0.896
2016	-0.502
2017	1.796
2018	2.310
2019	3.100
2020	0.019
2021	6.586
2022	14.325
2023	4.989
2024	2.901
2025	2.253
2026	2.100
2027	2.000
2028	2.000
2029	2.000