Year	Number
1977	1757
1978	1511
1985	1436
1987	2681
1988	2914
1989	1580
2005	5033
2006	5082
2007	6417
2008	4856
2009	4086
2010	4949
2011	5578
2012	5524
2013	5723
2014	5648
2015	5292
2016	4800
2017	5945
2018	5782
2019	5095
2020	4724
2021	6257