Year	Number
1960	9304
1961	10365
1962	11643
1963	13189
1964	15023
1965	17134
1966	19582
1967	22272
1968	25128
1969	28008
1970	30205
1971	31932
1972	33816
1973	35912
1974	38166
1975	40626
1976	43256
1977	45926
1978	48455
1979	50774
1980	52836
1981	56696
1982	60408
1983	62298
1984	64470
1985	65348
1986	65866
1987	67375
1988	69622
1989	72213
1990	75495
1991	77926
1992	80580
1993	83060
1994	86412
1995	90125
1996	94945
1997	99207
1998	103824
1999	106223
2000	110605
2001	117266
2002	122062
2003	122886
2004	125585
2005	128749
2006	132639
2007	137899
2008	145197
2009	150711
2010	158336
2011	170613
2012	184567
2013	196236
2014	206722
2015	220449
2016	242602
2017	267976
2018	297060
2019	330087
2020	359070
2021	373323
2022	416262
2023	469203