Year	Number
1964	167269
1965	165646
1966	163965
1967	161817
1968	159806
1969	158620
1970	157909
1971	156680
1972	155386
1973	154213
1974	151487
1975	150191
1976	148991
1977	147337
1978	145715
1979	143585
1980	141318
1981	138496
1982	135058
1983	131240
1984	127138
1985	122829
1986	118117
1987	114143
1988	109633
1989	105628
1990	101262
1991	97166
1992	92657
1993	89754
1994	86555
1995	83894
1996	80629
1997	77649
1998	74606
1999	70815
2000	66018
2001	61376
2002	56577
2003	51872
2004	48847
2005	45833
2006	42611
2007	39691
2008	37167
2009	35325
2010	33692
2011	32316
2012	30705
2013	29476
2014	29000
2015	28519
2016	28967
2017	26964
2018	26827
2019	25836
2020	24671
2021	24067
2022	23338