Year	Percent change (Units)
1992	-1.540
1993	-7.868
1994	4.107
1995	-6.164
1996	12.253
1997	19.731
1998	-13.190
1999	-5.567
2000	-9.177
2001	-8.245
2002	-2.277
2003	4.436
2004	6.621
2005	1.910
2006	30.736
2007	2.506
2008	-7.149
2009	18.531
2010	25.592
2011	6.539
2012	19.140
2013	6.276
2014	-39.182
2015	-6.393
2016	-15.012
2017	29.471
2018	7.163
2019	3.189
2020	-6.426
2021	5.513
2022	8.116
2023	2.927
2024	-1.848
2025	6.283
2026	4.807
2027	3.650
2028	3.622
2029	3.818