Year	Number
1960	1774
1961	1774
1962	1774
1963	1774
1964	1774
1966	1774
1967	1774
1968	1774
1969	1774
1971	1774
1972	1774
1973	1774
1974	1774
1987	2510
1988	2670
1989	2896
1990	3115
1991	3885
1992	4068
1993	4215
1994	6943
1995	8528
1996	15475
1997	20044
1998	24261
1999	27704
2000	30880
2001	33494
2002	35419
2003	31379
2004	32180
2005	32971
2006	25648
2007	37529
2008	43100
2009	54200
2010	358850
2011	530000
2012	584475
2013	420942
2014	361056
2015	256387
2016	227261
2017	132911
2018	88157
2019	56445
2020	55603
2021	40296
2022	38284