Year	Number
1960	1137766
1961	1130127
1962	1123613
1963	1119332
1964	1115860
1965	1113232
1966	1112558
1967	1110594
1968	1105074
1969	1095491
1970	1086612
1971	1078254
1972	1067846
1973	1057315
1974	1043318
1975	1033569
1976	1028459
1977	1020179
1978	1010209
1979	999641
1980	987828
1981	973456
1982	972322
1983	975328
1984	977206
1985	978898
1986	987976
1987	996738
1988	996241
1989	993604
1990	991288
1991	989377
1992	987408
1993	984540
1994	982864
1995	982559
1996	981408
1997	979573
1998	976923
1999	977086
2000	979466
2001	980492
2002	980172
2003	976273
2004	972385
2005	969570
2006	968153
2007	969042
2008	966007
2009	970209
2010	969840
2011	967238
2012	964643
2013	961339
2014	957645
2015	953743
2016	949506
2017	944897
2018	942771
2019	943491
2020	943608
2021	939634
2022	934533
2023	931346