Year	Number
1979	10400
1980	39000
1981	50000
1982	46700
1983	50300
1984	54500
1985	58900
1986	54000
1987	60100
1988	57700
1989	82100
1990	101300
1991	102300
1992	111200
1993	122600
1994	100500
1995	99900
1996	104000
1997	116400
1998	123700
1999	144100
2000	163909
2001	169526
2002	179041
2003	188842
2004	212951
2005	229987
2006	213587
2007	227624
2008	236182
2009	233515
2010	290195
2011	415864.084403732
2012	415130.020977764
2013	270996
2014	205992
2015	226549
2016	254396
2017	223673
2018	253417
2019	254439
2021	172017