Year	Percent change (Units)
1985	1.102
1986	2.452
1987	1.258
1988	1.295
1989	0.541
1990	2.470
1991	2.752
1992	2.900
1993	1.358
1994	4.545
1995	4.791
1996	1.101
1997	1.424
1998	-0.743
1999	0.357
2000	1.302
2001	-3.110
2002	-0.253
2003	1.943
2004	0.894
2005	1.105
2006	-0.319
2007	1.938
2008	1.882
2009	0.529
2010	0.185
2011	0.164
2012	0.038
2013	0.157
2014	1.229
2015	-1.392
2016	-0.627
2017	-0.460
2018	-0.006
2019	0.273
2020	2.000
2021	2.186
2022	3.289
2023	0.650
2024	1.300
2025	1.000
2026	1.000
2027	1.000
2028	1.000
2029	1.000