Year	Percent change
1980	13.858
1981	11.603
1982	20.667
1983	11.398
1984	10.284
1985	13.007
1986	2.534
1987	8.638
1988	12.265
1989	13.789
1990	17.782
1991	20.084
1992	27.332
1993	45.979
1994	28.814
1995	1.554
1996	8.864
1997	12.096
1998	5.612
1999	4.984
2000	7.77
2001	5.824
2002	2.156
2003	5.983
2004	8.381
2005	7.823
2006	6.041
2007	4.265
2008	15.101
2009	10.552
2010	4.309
2011	14.022
2012	9.378
2013	5.717
2014	6.878
2015	6.582
2016	6.318
2017	7.985
2018	4.69
2019	4.404
2020	5
2021	5
2022	5
2023	5
2024	5