Year	Number
1971	15699
1972	16138
1973	17659
1974	19612
1975	21085
1976	23446
1977	26129
1978	27804
1979	35789
1980	31731
1981	34868
1982	37318
1983	40770
1984	40840
1985	44588
1986	47506
1987	49749
1988	53568
1993	62700
1996	67414
1998	75001
2000	67548
2001	68963
2002	71175
2003	73284
2004	74685
2005	75743
2006	76817
2007	77904
2009	76560
2010	82989
2011	83720
2012	82982
2013	81832
2014	84324
2015	86456
2016	87924.1953125
2017	90642.09375
2018	91733.546875
2019	92603.59375
2020	90124.0234375
2021	89609.1484375
2022	91171