Year	Number
1970	1752005
1971	1876954
1972	1907160
1973	1931356
1974	1937002
1975	1899501
1976	1845796
1977	1825758
1978	1810257
1979	1804834
1980	1754075
1981	1714614
1982	1676005
1983	1647081
1984	1593266
1985	1596471
1986	1574899
1988	1543596
1989	1564047
1990	1593486
1991	1609140
1992	1583503
1993	1608204
1996	1687386
1997	1753867
1998	1777257
1999	1804612
2000	1798515
2002	1753952
2003	1713538
2004	1755997
2005	1720951
2006	1694765
2007	1679017
2008	1656810
2009	1611682
2010	1546543
2011	1520405
2012	1503898
2013	1472348
2014	1469099
2015	1477538
2016	1493732
2017	1514761
2018	1540085
2019	1552914
2020	1542099
2021	1539846
2022	1545104