Year	Number
1971	505784
1972	519141
1973	515551
1974	508554
1975	514321
1976	532520
1977	551899
1978	568947
1979	588823
1980	626168
1981	654436
1982	669903
1983	702764
1984	725831
1985	723260
1986	748444
1987	746025
1988	810651
1989	763167
1990	793018
1991	768603
1992	841722
1993	902331
1994	922078
1995	899748
1999	1001188
2000	1042521
2001	1017312
2002	1084443
2003	1146834
2004	1257998
2005	1348837
2006	1422631
2007	1547911
2008	1656374
2009	1762034
2011	2076418
2012	2143835
2013	2295190
2014	2224627
2015	2396253
2016	2458694
2017	2491604
2018	2605193
2019	2774390