Year	Number of
1980	74270
1981	73369
1982	72236
1983	73280
1984	74597
1985	64644
1986	71764
1987	70132
1988	67553
1989	62987
1990	50641
1991	50407
1992	53148
1993	63591
1994	70822
1995	84980
1996	111075
1997	119123
1998	110935
1999	134360
2000	140677
2001	132477
2002	128873
2003	129732
2004	121426
2005	127930
2006	124689
2007	127338
2008	128263
2009	132653
2010	125310
2011	112910
2012	105753
2013	106053
2014	102340
2015	99590
2016	92407
2017	84510
2018	78258
2019	73328
2020	58723