Year	Number
1971	472742
1972	475706
1973	471992
1974	462034
1975	438800
1976	429503
1977	440163
1982	497830
2009	303833
2010	299746
2011	269885
2012	268460
2013	263734
2014	258958
2015	250579
2016	227548
2018	208544