Year	Percent change (Units)
1992	12.447
1993	20.206
1994	29.901
1995	-12.628
1996	8.104
1997	12.764
1998	-9.365
1999	3.324
2000	-2.696
2001	7.587
2002	-5.037
2003	-1.454
2004	10.062
2005	2.948
2006	3.100
2007	8.885
2008	8.932
2009	5.431
2010	6.927
2011	16.654
2012	5.430
2013	3.064
2014	1.173
2015	1.158
2016	1.825
2017	2.234
2018	0.540
2019	1.716
2020	-2.044
2021	0.160
2022	3.349
2023	1.900
2024	4.750
2025	2.300
2026	2.000
2027	2.000
2028	2.000
2029	2.000