Year	Percent change
1980	2
1981	4.2
1982	17.695
1983	28.198
1984	30.044
1985	30.785
1986	40.491
1987	164.115
1988	58.507
1989	42.076
1990	43.723
1991	33.258
1992	45.076
1993	42.255
1994	63.123
1995	47.668
1996	48.491
1997	7.36
1998	1.487
1999	2.874
2000	12.713
2001	9.061
2002	16.769
2003	13.455
2004	12.634
2005	6.428
2006	13.245
2007	8.161
2008	14.503
2009	3.789
2010	12.426
2011	11.167
2012	2.602
2013	4.261
2014	2.56
2015	3.551
2016	19.853
2017	15.113
2018	3.911
2019	4.167
2020	5.501
2021	5.501
2022	5.501
2023	5.501
2024	5.501