Year	Number
1980	125951
1981	100535
1982	92401
1983	95965
1984	80546
1985	81297
1986	67976
1987	58851
1988	65760
1989	56163
1990	51472
1991	67229
1992	73990
1993	68444
1994	66950
1995	70301
1996	86492
1997	96444
1998	100868
1999	108804
2000	120443
2001	124178
2002	119545
2003	121174
2004	116622
2005	119294
2006	118475
2007	123606
2008	125789
2009	111028
2010	121885
2011	118649
2012	127658
2013	127925
2014	132015
2015	139754
2016	138799
2017	143949
2018	147900
2019	151430
2020	151788