Year	Percent change (Units)
1993	13.087
1994	-20.773
1995	23.123
1996	21.600
1997	17.288
1998	2.049
1999	-6.166
2000	29.964
2001	22.951
2002	12.199
2003	2.577
2004	28.166
2005	28.303
2006	10.975
2007	24.430
2008	6.168
2009	-11.120
2010	-5.813
2011	3.936
2012	27.727
2013	6.928
2014	-5.936
2015	-5.320
2016	-13.738
2017	5.012
2018	8.434
2019	12.528
2020	-27.354
2021	-10.731
2022	14.058
2023	26.253
2024	5.976
2025	4.123
2026	3.573
2027	3.495
2028	3.249
2029	3.241