Year	Percent change
1980	24.672
1981	18.27
1982	5.388
1983	21.435
1984	9.482
1985	1.482
1986	9.074
1987	10.167
1988	15.03
1989	15.103
1990	19.622
1991	9.015
1992	13.815
1993	10.32
1994	4.21
1995	11.512
1996	16.801
1997	10.741
1998	3.724
1999	3.984
2000	10.837
2001	10.817
2002	11.289
2003	12.182
2004	13.075
2005	7.495
2006	13.347
2007	18.805
2008	13.905
2009	5.065
2010	6.799
2011	4.861
2012	9.272
2013	4.646
2014	1.351
2015	4.571
2016	4.463
2017	7.149
2018	2.766
2019	4.5
2020	4.7
2021	4.7
2022	4.9
2023	5
2024	5