Year	Number
1971	34646
1972	37550
1973	41787
1974	45210
1975	47861
1976	50478
1977	53913
1978	56480
1979	60157
1980	59719
1981	68199
1984	92706
1985	101056
1986	94717
1988	112787
1989	100026
1990	101726
1991	102474
2001	155567
2011	352732
2012	400800
2013	417307
2015	449320
2016	487826
2017	492140
2018	522036
2019	756770
2020	789447
2021	945906