Year	Number
1961	9244087
1962	9584264
1963	9949959
1964	10303576
1965	10622199
1966	11606266
1967	11872289
1968	12132281
1969	12402202
1970	12536441
1971	12746828
1972	12937862
1973	13183148
1974	13591842
1975	13645195
1976	13930224
1977	14259683
1978	14586673
1979	14760912
1980	15267778
1981	15395393
1982	15692276
1983	15933092
1984	16165711
1985	16612422.57
1986	16870305.14
1987	17097945.71
1988	17130119
1989	17260150
1990	16831907
1991	16598516
1992	16641291
1993	16825442
1994	17000172
1995	17093528
1996	17104891
1997	17174153
1998	17225062
1999	17287845
2000	17285258.5
2001	16393845
2002	16551492
2003	14738790
2004	14678617
2005	14687300