Year	Percent change (Units)
1980	1.786
1981	11.900
1982	-1.305
1983	3.800
1984	7.702
1985	3.575
1986	1.685
1987	4.113
1988	5.189
1989	8.527
1990	6.857
1991	-1.971
1992	7.285
1993	8.973
1994	9.626
1995	12.584
1996	1.446
1997	5.035
1998	2.694
1999	-0.978
2000	12.085
2001	2.571
2002	-2.804
2003	-1.299
2004	6.130
2005	3.217
2006	8.310
2007	6.197
2008	-3.169
2009	-17.817
2010	11.761
2011	5.420
2012	2.032
2013	0.374
2014	2.615
2015	4.274
2016	1.865
2017	5.437
2018	2.142
2019	1.573
2020	-13.508
2021	14.065
2022	10.241
2023	0.179
2024	0.830
2025	1.375
2026	1.658
2027	1.597
2028	1.393
2029	1.562