Year	Number
1974	710000
1975	1000000
1976	1050000
1977	1110000
1978	1540000
1979	2519000
1980	2568000
1981	3236000
1982	3942000
1983	3836000
1984	5000000
1985	7300000
1986	10000000
1987	12500000
1988	17000000
1989	11080000
1990	16596100
1991	19520000
1992	27345000
1993	31312500
1994	37601000
1995	47564500
1996	51770100
1997	52277000
1998	53234000
1999	55853100
2000	61891807
2001	72660653
2002	83671798
2003	86040642
2004	119789024
2005	136721623
2006	158013351
2007	183613132
2008	191001220
2009	229062099
2010	266293020
2011	292160158
2012	318475924
2013	352795296
2014	390878784
2015	436183969
2016	487960477
2017	551234509
2018	611439830
2019	659629070
2020	417255845
2021	440301216