Year	Number
1960	500746
1961	500746
1962	500746
1963	500746
1964	500746
1966	687236
1967	687236
1968	687236
1969	687236
1970	999259
1971	1007686
1972	1007686
1973	1007686
1974	1007686
1975	1463451
1976	1640658
1977	1772672
1978	1883428
1979	2004866
1980	2075463
1981	2884885
1982	3454428
1983	3788041
1984	4135081
1985	4792293
1986	5363459
1987	5874185
1988	6357110
1989	6884996
1990	7517765
1991	8197042
1992	9396858
1993	10595928
1994	11992103
1995	13587706
1996	15241322
1997	16979922
1998	19077601
1999	21455862
2000	23891189
2001	26844379
2002	30999195
2003	35153403
2004	37645128
2005	43287950
2006	46807021
2007	50226310
2008	52187774
2009	52759204
2010	53161564
2011	54203940
2012	54741591
2013	53522015
2014	51654014
2015	52641056
2016	54149953
2017	55443283
2018	53263392
2019	56119885
2020	57773306
2021	59599643
2022	55514718