Year	Percent change (Units)
1993	-9.400
1994	9.400
1995	8.867
1996	-3.829
1997	32.113
1998	18.441
1999	-39.063
2000	14.579
2001	16.955
2002	19.018
2003	6.200
2004	11.524
2005	10.037
2006	26.976
2007	34.386
2008	22.180
2009	-32.624
2010	28.980
2011	20.092
2012	7.203
2013	1.117
2014	-7.821
2015	-25.818
2016	-4.283
2017	16.808
2018	2.692
2019	2.807
2020	-11.823
2021	16.658
2022	-14.590
2023	15.958
2024	1.548
2025	1.896
2026	1.737
2027	1.864
2028	2.000
2029	2.233