Year	Percent change
1980	18.121
1981	36.806
1982	90.271
1983	32.503
1984	12.013
1985	15.129
1986	11.788
1987	16.806
1988	20.845
1989	16.491
1990	19.069
1991	28.665
1992	21.807
1993	9.778
1994	13.544
1995	23.182
1996	17.515
1997	13.235
1998	11.67
1999	10.045
2000	10.959
2001	11.254
2002	9.169
2003	9.443
2004	12.318
2005	13.794
2006	11.476
2007	9.357
2008	13.424
2009	7.839
2010	5.665
2011	4.879
2012	4.495
2013	5.232
2014	4.518
2015	0.802
2016	-0.017
2017	1.626
2018	2.312
2019	2.611
2020	3.103
2021	3
2022	3
2023	3
2024	3