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	9323858
1993	10520928
1994	11913703
1995	13507706
1996	15157941
1997	16869029
1998	18910330
1999	21233664
2000	23618978
2001	26589161
2002	30757301
2003	34909909
2004	37373670
2005	42950925
2006	46485022
2007	49877522
2008	51832970
2009	52390988
2010	52801162
2011	53821240
2012	54347711
2013	53118990
2014	51250896
2015	52234556
2016	53717953
2017	54967044
2018	52793651
2019	55652696
2020	57307023
2021	59113814
2022	55057012