Year	Number
1977	50
1978	15050
1979	15360
1980	15550
1981	1030
1982	1400
1983	3680
1984	4280
1985	5000
1986	105000
1987	73000
1988	78157
1989	80130
1990	2938
1991	29977
1992	59680
1993	54450
1994	48305
1995	53453
1996	53546
1997	40965
1998	61380
1999	60477
2000	60543
2001	69462
2002	82795
2003	61876
2004	66379
2005	81932
2006	95791
2007	117358
2008	140166
2009	170850
2010	190088
2011	214736
2012	237176
2013	241281
2014	257637
2015	267163
2016	269778
2017	270913
2018	264359
2019	268503
2020	166906
2021	89467
2022	77458
2023	55568