Year	Number
1971	38711
1972	39609
1973	40530
1974	41631
1975	43965
1976	44857
1977	45694
1978	46326
1979	47825
1980	48672
1981	48451
1982	49298
1983	50217
1984	53575
1985	55496
1986	57330
1987	58488
1988	60605
1989	63179
1990	64000
1991	66597
1992	66694
1993	68898
1994	70513
1995	72329
1996	72526
1997	72876
1998	74058
1999	76302
2000	77720
2001	79407
2002	81057
2003	81887
2004	82708
2005	83299
2006	89721
2011	93038
2012	95524
2013	99702
2014	103806
2015	108154
2016	112179
2017	113470
2018	113878
2019	115819
2022	115023