Year	Number
1960	0
1965	0
1970	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	1800
1989	3685
1990	7422
1991	16600
1992	78560
1993	182600
1994	319000
1995	403800
1996	581700
1997	1071900
1998	2009757
1999	3784735
2000	5447172
2001	6472584
2002	6541894
2003	7015121
2004	8420980
2005	12495721
2006	18789466
2007	23820133
2008	27414377
2009	28123570
2010	27880132
2011	28781999
2012	30569073
2013	30896079
2014	30528022
2015	29093517
2016	27600893
2017	24493687
2018	20731169
2019	18476236
2020	16543805
2021	17008910
2022	17948623