Year	Number
1970	363518
1971	357936
1972	354748
1973	345284
1974	337816
1975	328401
1976	316265
1977	306349
1978	297102
1979	290859
1980	291722
1981	285179
1982	286780
1983	290800
1984	288623
1985	278060
1986	268820
1987	261603
1988	259270
1989	257833
1990	257932
1991	260286
1992	262599
1993	261534
1994	251097
1995	261648
1996	269668
2007	301101
2008	299704
2009	294602
2010	263906
2011	258293
2012	252735
2013	244045
2014	241676
2015	239095
2016	236943
2017	234653
2018	233553
2019	234947
2020	232810
2021	234240