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	0
1989	0
1990	150
1991	147
1992	181
1993	282
1994	350
1995	400
1996	570
1997	976
1998	1410
1999	2012
2000	4300
2001	6414
2002	7553
2003	42293
2004	43313
2005	46858
2006	46193
2007	51381
2008	60022
2009	114424
2010	121946
2011	120855
2012	129912
2013	133000
2014	117151
2015	119767
2016	118973
2017	113177
2018	118721
2019	116184
2020	118760
2021	101018