Year	Number
1977	2447
1978	1828
1979	3944
1980	3563
1981	4399
1982	4934
1983	4631
1984	4363
1986	4076
1991	5424
1992	6474
1993	7266
1994	8404
1995	7566
2005	12
2006	186
2007	109
2008	162
2009	45
2010	213.212997436523
2011	533.932006835938
2012	75.0299987792969
2013	212.309997558594
2014	74.5350036621094
2015	258.981994628906
2016	93.9929962158203
2017	195.488998413086
2018	361.89599609375
2019	1676
2020	1002