Year	Number
1971	0
1972	0
1973	194
1974	419
1975	723
1976	1379
1977	2579
1978	5647
1979	8534
1980	11978
1981	16776
1982	21226
1983	28221
1984	33913
1985	41580
1986	47305
1987	54044
1988	61287
1989	71015
1990	85264
1991	101567
1992	119244
1993	140201
1994	162363
1995	179514
1996	194904
1997	205046
1998	217246
1999	229031
2000	242533
2001	254496
2002	266923
2003	279302
2005	301568
2006	308508
2007	316019
2008	317816
2009	321670
2011	301073
2012	300067
2013	292814
2015	286900
2016	294485
2017	295770
2018	422440
2019	436578
2020	454056
2021	473208
2022	489374