Year	Number
1968	170108
1969	171220
1970	172148
1971	173922
1972	174876
1973	175977
1974	178512
1975	180446
1976	181485
1977	183027
1978	184551
1979	184781
1980	184798
1981	185147
1982	186068
1983	188036
1984	187088
1985	188014
1986	189485
1987	192491
1988	196543
1989	202660
1990	207424
1991	212879
1992	218488
1993	224790
1994	230427
1995	235312
1996	238532
1997	240131
1998	241017
1999	244952
2000	247909
2001	248767
2002	248643
2003	247611
2004	246064
2005	246290
2006	246763
2007	248504
2008	251655
2009	254272
2010	257058
2011	260629
2012	262655
2013	264761
2014	267601
2015	270010
2016	272606
2017	274398
2018	275669
2019	275766
2020	275267
2021	275554
2022	274498