Year	Number
1970	132000
1971	132000
1972	132000
1973	132000
1974	132000
1975	219000
1976	244914
1977	266799
1978	302480
1979	331627
1980	362000
1981	396000
1982	443000
1983	500000
1984	540000
1985	580000
1986	620000
1987	660000
1988	704619
1989	753924
1990	822988
1991	891217
1992	954616
1993	1027430
1994	1205220
1995	1287061
1996	1389026
1997	1488065
1998	1557969
1999	1633564
2000	1721139
2001	1781000
2002	1825000
2003	1871300
2004	1887600
2005	1882500
2006	1831050
2007	1846700
2008	1878080
2009	1859190
2010	1865729
2011	1848031
2012	1743540
2013	1668265
2014	1568981
2015	1476506
2016	1435977
2017	1401354
2018	1355662
2019	1333661
2020	1299329
2021	1268941
2022	1234915