Year	Number
2004	30236
2005	29260
2006	26686
2007	26112
2008	29356
2009	22508
2010	23923
2011	24657
2012	20994
2013	21053
2014	20535
2015	19620
2016	19687
2017	22561
2018	24199
2019	25391
2020	26328
2021	26098