Year	Number
1970	175929
1971	181230
1972	184508
1973	183796
1974	185566
1975	195997
1976	199256
1977	199384
1979	206275
1980	193640
1981	200388
1982	206535
1984	218520
1985	229715
1986	238818
1987	252259
1988	259579
1994	295488
1996	313764
1997	309162
1998	234143
1999	221495
2000	244412
2001	274580
2002	283403
2004	274232
2005	279349
2006	286782
2007	302654
2008	288776
2010	258025
2011	258480
2012	266518
2013	269252
2014	272654
2015	275833
2016	277100
2017	280094
2018	287067
2019	289504
2020	288107
2021	289846
2022	292277