Year	Number
1971	248908
1972	259757
1973	271074
1974	278609
1975	282793
1976	285786
1977	280315
1978	275564
1979	275020
1980	270346
1982	250510
1983	245000
1984	243000
1985	244000
1987	213000
1988	215000
1989	225000
1990	228000
1991	229100
1992	230200
1999	249384
2000	248148
2001	261362
2002	264111
2003	262390
2004	258966
2005	265257
2006	249862
2007	255690
2008	244391
2009	245879
2010	252290
2011	255994
2012	247079
2013	250692.984375
2014	272430
2016	313648.9375
2017	318533.15625
2018	279097.09375
2019	280504.6875
2020	281265.78125
2021	285964.65625