Year	Number
1971	707
1972	751
1975	1187
1976	1294
1977	1417
1980	1218
1981	1261
1982	1151
1983	1555
1984	1565
1985	1561
1986	1767
1994	1581
1995	1485
1999	2406
2002	2029
2004	2150
2006	2335
2007	2420
2008	2333
2009	2683
2010	2402
2011	1996
2012	1634
2013	1803
2014	1743
2015	1555
2016	1611
2017	1555
2018	1517
2019	1482
2021	1722