Year	Number
1971	9668
1972	11852
1974	11216
1975	10939
1976	11340
1977	10912
1978	10159
1979	9557
1984	11394
1992	9298
1995	10727
2000	13025
2007	11569
2008	11562
2009	11276
2010	11254
2011	10855
2012	10453
2013	10191
2014	10172
2015	10077
2016	9771
2017	9946
2018	10123
2019	9943