Year	Number
1971	435066
1974	448535
1978	380695
1980	388482
1981	405402
1982	398977
1983	382500
1985	329340
1987	399029
1989	346534
1992	345662
1993	346763
1994	360858
1995	365174
1996	367862
1997	382309
1998	397905
1999	413753
2000	404169
2001	476489
2002	474396
2003	471777
2004	476446
2005	475798
2006	470988
2007	473134
2008	467311
2009	464442
2010	461719
2011	456985
2012	456206
2013	471626
2014	480923
2015	491455
2016	486613
2017	502505
2018	509280
2019	516514
2020	517092
2021	509734
2022	519794