Year	Number
1971	47452
1972	50692
1973	53750
1974	57199
1978	88764
1979	91107
1980	95827
1981	112178
1982	117644
1983	129268
1984	132217
1986	138640
1987	146799
1988	144543
1989	150004
1990	155661
1991	159401
1992	170611
1993	178802
1994	188545
1995	202603
1997	218829
2012	432297
2013	524654
2014	559445
2015	594443
2016	658370
2017	657390
2018	687819
2019	725432
2020	752221
2021	752907