Year	Number
1970	40478
1971	44165
1972	48645
1973	52011
1974	55401
1975	58093
1976	60989
1977	63449
1978	64785
1979	65233
1980	64141
1981	62491
1983	62212
1984	61441
1985	59759
1986	60995
1987	62982
1991	78565
1992	84470
1998	96733
1999	96568
2000	95107
2001	93536
2002	95047
2003	96891
2004	99183
2006	98017
2007	96235
2008	95210
2009	95550
2011	98889
2012	95865
2015	93021
2016	92262