Year	Percent change (Units)
1980	15.578
1981	14.549
1982	14.416
1983	12.174
1984	11.280
1985	8.815
1986	8.795
1987	5.248
1988	4.837
1989	6.791
1990	6.722
1991	5.934
1992	7.145
1993	4.569
1994	4.718
1995	4.674
1996	3.599
1997	1.877
1998	1.764
1999	2.235
2000	3.484
2001	2.825
2002	3.590
2003	3.103
2004	3.054
2005	3.384
2006	3.561
2007	2.843
2008	4.131
2009	-0.239
2010	2.043
2011	3.050
2012	2.436
2013	1.530
2014	-0.190
2015	-0.629
2016	-0.337
2017	2.036
2018	1.736
2019	0.780
2020	-0.337
2021	3.008
2022	8.323
2023	3.400
2024	2.674
2025	2.361
2026	1.889
2027	1.800
2028	1.800
2029	1.800