Year	Number
1972	784
1973	626
1974	594
1976	731
1977	877
1978	919
1982	1155
1983	1269
1984	1512
1985	1644
1986	1849
1987	1908
1989	1868
1990	2153
1991	2026
1992	2211
1993	2562
2003	6855
2004	7176
2005	7498
2006	6770
2007	7501
2009	10895
2010	11275
2011	12968
2012	14141
2013	15504
2014	15673
2015	18558
2016	22512
2017	23729
2018	25372
2019	25710
2021	28321
2022	28450