Year	Number
1970	65965
1971	67430
1972	69273
1973	71294
1974	72993
1975	72641
1976	73849
1977	75491
1978	77844
1979	80331
1980	84360
1981	86893
1982	89370
1983	98113
1984	101307
1985	106600
1986	108452
1987	115093
1988	122199
1989	129793
1990	132556
1991	134687
1992	135502
1993	145396
1994	145795
1995	146242
1996	151664
1997	153951
1998	170162
1999	151261
2000	150922
2001	147432
2002	170737
2003	175302
2004	177364
2005	177060
2006	184005
2007	183266
2008	184641
2009	187894
2010	191177
2011	187654
2012	181292
2013	196036
2014	197928
2015	195444
2016	195273
2017	197603
2018	206638
2019	212567
2020	210704
2021	212859
2022	215899
2023	220912