Year	Number
1960	371934
1961	369235
1962	365665
1963	361852
1964	358556
1965	356075
1966	354671
1967	354089
1968	354057
1969	353774
1970	354917
1971	357903
1972	361247
1973	365096
1974	369353
1975	374026
1976	379916
1977	387174
1978	395612
1979	404833
1980	416327
1981	433308
1982	452496
1983	467813
1984	477487
1985	483017
1986	490475
1987	499674
1988	507761
1989	514133
1990	517304
1991	517996
1992	516659
1993	508487
1994	499762
1995	492817
1996	485535
1997	478285
1998	470762
1999	464679
2000	458108
2001	454609
2002	453296
2003	447771
2004	440750
2005	434712
2006	429711
2007	430040
2008	431377
2009	430182
2010	429596
2011	427806
2012	423373
2013	415866
2014	404119
2015	389573
2016	376757
2017	366517
2018	357079
2019	348420
2020	340243
2021	331603
2022	323638