Year	Number
1979	400
1980	400
1981	1200
1982	1200
1983	1200
1984	1200
1985	83200
1986	111000
1987	1000
1990	900
1991	87990
1992	115000
1993	109066
1994	119581
1995	116722
1996	112957
1997	104032
1998	104022
1999	128913
2000	127787
2001	128142
2002	134190
2003	46721
2004	46053
2005	50177
2006	44406
2007	42352
2008	39503
2009	35213
2010	34647
2011	35184
2012	98818
2013	246294
2014	271137
2015	277702
2016	261863
2017	277668
2018	283018
2019	273986
2020	270377
2021	280072
2022	273716
2023	286480