Year	number
2006	8868
2007	7939
2008	11111
2009	10657
2010	9573
2011	12267
2012	13989
2013	14231
2014	15583
2015	14140
2016	14816
2017	16683
2018	15708
2019	14401
2020	13981
2021	16926
2022	17867