Year	Number
1971	203703
1972	217070
1973	224699
1974	236622
1975	240521
1976	252393
1977	265496
1978	280459
1979	293227
1980	298697
1981	291159
1982	291546
1983	296301
1984	293050
1985	294153
1986	292395
1987	298913
1988	307587
1989	365158
1990	377372
1991	395334
1992	430636
1993	494581
1994	557084
1995	612469
1996	683163
1997	778450
1998	862874
1999	958935
2000	1016575
2001	1127360
2002	1227267
2003	1294672
2004	1396791
2005	1505903
2006	1609979
2007	1716956
2008	1823037
2009	1926242
2010	2018551
2011	2114844
2012	2113857
2013	2068714
2014	2181617
2015	2227082
2016	2356420
2017	2538502
2018	2477081
2020	2734067
2021	2742648