Year	Number
1980	54989
1981	58555
1982	58521
1983	56537
1984	53622
1985	54376
1986	52218
1987	53670
1988	51863
1989	49148
1990	46066
1991	44025
1992	45487
1993	48420
1994	50631
1995	54176
1996	60884
1997	66712
1998	94333
1999	108326
2000	120354
2001	134549
2002	151147
2003	165722
2004	189009
2005	242357
2006	282087
2007	348222
2008	394926
2009	436651
2010	503920
2011	600405
2012	743004
2013	751368
2014	650988
2015	656558
2016	734679
2017	710436
2018	788470
2019	791562
2020	853990