Year	Percent change (Units)
1980	-1.780
1981	8.024
1982	-7.188
1983	-5.250
1984	4.451
1985	-2.522
1986	-19.269
1987	5.304
1988	-2.623
1989	15.733
1990	23.562
1991	2.176
1992	3.144
1993	0.262
1994	7.449
1995	6.629
1996	5.399
1997	8.567
1998	0.878
1999	3.830
2000	12.322
2001	1.399
2002	2.433
2003	8.801
2004	9.566
2005	4.855
2006	9.837
2007	3.184
2008	3.192
2009	-5.243
2010	5.284
2011	6.216
2012	1.824
2013	5.056
2014	4.166
2015	6.787
2016	5.561
2017	0.735
2018	1.314
2019	1.108
2020	-4.957
2021	4.355
2022	7.850
2023	3.404
2024	3.515
2025	4.171
2026	4.267
2027	4.363
2028	4.461
2029	4.543