Year	Number
1971	50809
1972	46262
1973	54758
1974	62667
1975	70211
1976	70933
1977	70493
1978	71956
1979	66631
1980	30172
1981	30596
1982	36958
1983	40187
1984	47512
1985	107815
1986	120173
1987	103529
1988	94050
1989	92610
1990	82735
1991	87137
1992	88877
2004	14563
2005	2438
2006	29481
2007	56752
2008	6238
2009	14384
2010	10437
2011	21673
2012	41265
2013	41331
2014	40429
2015	44471
2016	52497
2017	54437
2018	59053
2019	61976
2020	77093
2022	79397