Year	number
2006	3694
2007	4112
2008	4164
2009	2136
2010	2480
2011	2265
2012	2019
2013	2202
2014	2092
2015	1960
2016	1832
2018	1672
2019	1543
2020	1628
2021	1727
2022	1680