Year	Number
1970	112500
1971	101100
1972	98000
1973	43000
1974	88800
1975	113500
1976	119000
1977	137800
1978	136300
1979	156300
1980	118900
1981	124400
1982	114600
1983	99500
1984	124000
1985	108400
1986	103100
1987	114800
1988	98900
1989	110200
1990	156000
1991	165000
1992	230000
1993	240000
1994	252000
1995	300000
1996	300000
1997	508400
1998	506400
2010	313892
2011	326146.206150004
2012	288013.900825685
2013	78264
2014	69768
2015	93129
2016	111830
2017	155524
2018	145795
2019	107350
2020	25217.454
2021	1766.181