Year	Number
1970	108700
1971	51000
1972	47900
1973	51600
1974	56500
1975	95000
1976	113700
1977	120400
1978	132200
1979	137300
1980	151100
1981	379100
1982	382300
1983	388500
1984	397700
1985	182700
1986	184900
1987	183400
1988	190700
1989	218200
1990	200200
1991	177700
1992	195100
1993	186200
1994	156900
1995	174700
1996	178700
1997	157600
1998	162400
1999	259600
2000	107979
2001	46364
2010	516085
2011	89791.8677663574
2012	39485.4722019258
2013	234996
2014	237120
2015	642893
2016	667062
2017	808471
2018	825257
2019	748540
2020	322841
2021	569309