Year	Percent change (Units)
1993	-11.894
1994	16.143
1995	29.324
1996	13.534
1997	15.769
1998	19.343
1999	-2.700
2000	2.675
2001	15.639
2002	2.711
2003	11.865
2004	20.656
2005	17.055
2006	21.879
2007	17.446
2008	-11.140
2009	-30.894
2010	12.806
2011	22.780
2012	5.247
2013	-0.127
2014	3.000
2015	1.647
2016	3.565
2017	8.546
2018	6.338
2019	2.224
2020	-1.143
2021	15.061
2022	11.094
2023	-2.857
2024	3.000
2025	2.500
2026	2.500
2027	2.500
2028	2.500
2029	2.500