Year	Number
1971	13752
1976	19936
1977	21890
1978	23903
1979	25601
1980	72216
1981	110314
1982	118877
1983	132998
1984	140478
1985	156347
1986	162031
1987	169355
1988	176217
1989	193154
1990	195709
1991	200628
1992	171866
1999	105292
2000	129620
2001	141163
2002	157289
2003	179153
2004	203551
2005	218517
2006	239629
2007	266518
2008	288036
2009	346518
2010	425587
2011	486442
2012	534712
2013	581962
2014	587069
2015	567838
2016	572324
2017	610972
2018	658285
2019	732104
2021	782846
2022	800456