Year	Percent change
1980	15.157
1981	12.017
1982	5.364
1983	5.333
1984	4.603
1985	5.611
1986	3.75
1987	3.715
1988	7.688
1989	5.496
1990	7.847
1991	7.014
1992	2.681
1993	2.435
1994	1.791
1995	2.822
1996	2.404
1997	1.781
1998	1.385
1999	1.123
2000	0.955
2001	1.021
2002	1.524
2003	1.315
2004	1.436
2005	2.127
2006	2.715
2007	2.119
2008	3.88
2009	2.121
2010	3.38
2011	4.631
2012	2.634
2013	2.068
2014	0.914
2015	0.064
2016	1.212
2017	3.029
2018	2.273
2019	1.815
2020	2.008
2021	2.018
2022	2
2023	2
2024	2