Year	number
2006	9913
2007	10603
2008	10156
2009	7806
2010	7139
2011	7116
2012	7949
2013	14186
2014	12964
2015	12558
2016	13502
2017	14918
2018	15585
2019	14633
2020	11539
2021	13711
2022	15309