Year	Percent change (Units)
1990	-0.180
1991	35.717
1992	225.996
1993	85.005
1994	22.565
1995	7.794
1996	12.734
1997	33.167
1998	20.646
1999	0.389
2000	0.039
2001	3.120
2002	5.202
2003	2.363
2004	2.867
2005	2.363
2006	2.370
2007	2.960
2008	3.310
2009	2.231
2010	3.615
2011	3.443
2012	2.036
2013	1.925
2014	1.613
2015	1.868
2016	1.287
2017	1.985
2018	2.029
2019	1.411
2020	1.621
2021	2.043
2022	6.726
2023	4.769
2024	3.495
2025	2.999
2026	2.957
2027	3.003
2028	3.024
2029	2.999