Year	Percent change
1980	18.074
1981	9.406
1982	9.023
1983	8.213
1984	4.726
1985	3.363
1986	4.353
1987	2.487
1988	4.491
1989	9.85
1990	23.323
1991	33.949
1992	8.741
1993	10.775
1994	21.769
1995	29.432
1996	23.845
1997	20.2
1998	13.668
1999	11.664
2000	11.047
2001	9.675
2002	7.691
2003	7.674
2004	8.114
2005	8.809
2006	5.578
2007	6.936
2008	11.403
2009	5.496
2010	4.699
2011	6.762
2012	5.218
2013	5.186
2014	6.082
2015	3.158
2016	2.725
2017	3.934
2018	4.348
2019	4.7
2020	4.465
2021	4.242
2022	4.03
2023	4
2024	4