Year	Number
1967	33000
1968	38300
1969	37350
1970	60840
1971	60000
1972	49020
1973	50900
1974	53700
1975	95500
1976	110100
1977	150000
1978	270000
1979	351700
1980	493000
1981	553000
1982	637000
1983	690000
1984	971000
1985	1164000
1986	974200
1987	807070
1988	745000
1989	767729
1990	1031050
1991	729200
1992	725900
1993	745200
1994	727174
1995	674071
1996	393874
1997	374414
1998	391496
1999	390995
2000	414928
2001	349209
2002	328177
2003	138162
2004	141587
2005	147255
2006	196200
2007	222720
2008	181605
2009	186292
2010	178305
2011	139407
2012	152188
2013	159848
2014	277818
2015	309632
2016	421459
2017	906590
2018	1078280
2019	1055489
2020	1040288
2021	1103918
2022	1097128
2023	922474