Year	Number
1961	9210332
1962	9551528
1963	9914656
1964	10275019
1965	10594894
1966	11575352
1967	11829246
1968	12080061.52
1969	12341753.120000001
1970	12468822.719999999
1971	12673714.08
1972	12848676.08
1973	13074282.879999999
1974	13443742.04
1975	13456593.48
1976	13710593.32
1977	14010768.32
1978	14282683
1979	14420508
1980	14899564
1981	14989080
1982	15263777
1983	15476147
1984	15670531
1985	16077802
1986	16286542
1987	16464924
1988	16437959
1989	16514949
1990	16023315
1991	15763511
1992	15808750
1993	15993708
1994	16162178
1995	16252435
1996	16242202
1997	16248526
1998	16299306
1999	16335577
2000	16317861.5
2001	15428452
2002	15585456
2003	13737793
2004	13663311