Year	Number
1970	146900
1971	159400
1972	167300
1973	176400
1974	178800
1975	181800
1976	184500
1977	192700
1978	209300
1979	214200
1980	207900
1981	188700
1982	191000
1983	194000
1984	184900
1985	181700
1986	180400
1987	183000
1988	207200
1989	225500
1990	244700
1991	262600
1992	289700
1993	282200
1994	282300
1995	313200
1996	332800
1997	370400
1998	387900
1999	414200
2000	485856
2001	517481
2002	493019
2003	518836
2004	549963
2005	586438
2006	602978
2007	657606
2008	616893
2009	547971
2010	546298.853885983
2011	535074
2012	471440.886886395
2013	465558.909
2014	486353.8
2015	534895
2016	566775
2017	579842
2018	641097
2019	677578.545
2020	261972.271
2021	381188.363