Year	Number
1998	7345
1999	13391
2000	13833
2001	13571
2002	13630
2003	14005
2004	14260
2005	14550
2006	14727
2007	15185
2008	15577
2009	16110
2010	16537
2011	17268
2012	17742
2013	17978
2014	17861
2015	17924
2016	18056
2017	18435
2018	18741
2019	18693
2020	18590
2021	18800