Year	Number
1970	2482054
1971	2553534
1972	2355999
1973	2309895
1974	2280492
1975	2193018
1976	2020931
1977	1960229
1978	1915253
1979	2000839
1980	1873696
1981	1943227
1982	1920940
1983	1928228
1984	1830800
1985	1900259
1986	1904129
1987	1875871
1988	1914375
1989	2022672
1990	1716619
1991	1717924
1992	2037734
1993	2116352
1994	2012169
1995	2204502
1996	2083260
1997	2119833
1998	2278111
1999	2209774
2000	2037888
2001	1511502
2002	1242772
2003	1161898
2004	1035840
2005	1139797
2006	1225557
2007	1081896
2008	977199
2009	857347
2010	741105
2011	798175
2012	637123
2013	843149