Year	Percent change (Units)
1980	8.755
1981	8.145
1982	8.097
1983	7.159
1984	5.348
1985	4.023
1986	0.587
1987	1.448
1988	1.923
1989	3.601
1990	3.495
1991	2.785
1992	2.184
1993	2.464
1994	1.988
1995	1.227
1996	2.140
1997	0.884
1998	0.692
1999	2.051
2000	2.964
2001	1.925
2002	1.333
2003	1.634
2004	2.010
2005	2.759
2006	2.073
2007	3.111
2008	2.699
2009	0.333
2010	3.382
2011	3.185
2012	2.082
2013	1.167
2014	-0.391
2015	1.450
2016	2.204
2017	2.059
2018	2.198
2019	0.922
2020	0.351
2021	6.592
2022	10.213
2023	0.532
2024	3.375
2025	1.709
2026	1.921
2027	1.972
2028	2.024
2029	2.052