Year	Percent change (Units)
1980	40.039
1981	34.884
1982	37.069
1983	76.730
1984	52.630
1985	23.460
1986	46.730
1987	90.370
1988	82.749
1989	104.065
1990	81.295
1991	2154.440
1992	4129.170
1993	1986.900
1994	23773.100
1995	541.801
1996	617.000
1997	199.000
1998	29.145
1999	284.900
2000	550.000
2001	357.280
2002	25.316
2003	12.817
2004	4.001
2005	21.545
2006	12.845
2007	16.672
2008	17.966
2009	46.101
2010	23.461
2011	14.950
2012	0.857
2013	0.876
2014	1.240
2015	0.738
2016	3.193
2017	35.734
2018	29.266
2019	4.705
2020	11.358
2021	8.989
2022	9.266
2023	19.894
2024	17.247
2025	8.472
2026	6.952
2027	6.952
2028	6.952
2029	7.000