Year	Percent change
1980	32.202
1981	13.695
1982	4.833
1983	1.963
1984	2.448
1985	3.015
1986	1.389
1987	6.053
1988	7.182
1989	5.071
1990	9.338
1991	9.251
1992	4.458
1993	5.801
1994	5.568
1995	4.753
1996	4.926
1997	6.574
1998	3.966
1999	1.355
2000	2.78
2001	3.163
2002	3.734
2003	3.419
2004	3.035
2005	2.619
2006	2.089
2007	3.607
2008	4.139
2009	2.801
2010	3.034
2011	4.159
2012	1.426
2013	1.143
2014	0.833
2015	1.132
2016	1.337
2017	1.408
2018	1.321
2019	1.4
2020	1.55
2021	1.7
2022	1.8
2023	1.9
2024	2