Year	Number
1960	177729
1961	182508
1962	186798
1963	190745
1964	194715
1965	198868
1966	202771
1967	206689
1968	210793
1969	214191
1970	217047
1971	220075
1972	223397
1973	226907
1974	231020
1975	235293
1976	239449
1977	243967
1978	248404
1979	252494
1980	256196
1981	259420
1982	263005
1983	266856
1984	269797
1985	273625
1986	278078
1987	281293
1988	284172
1989	286689
1990	288043
1991	288870
1992	289410
1993	288952
1994	288498
1995	288316
1996	287875
1997	287345
1998	286393
1999	284741
2000	282962
2001	281816
2002	281362
2003	281969
2004	284011
2005	287046
2006	290251
2007	294334
2008	300444
2009	309335
2010	320321
2011	333160
2012	346859
2013	359649
2014	372120
2015	384048
2016	395607
2017	407490
2018	419666
2019	431966
2020	444574
2021	457857
2022	472154
2023	487146