Year	Number
1996	19352.249869967196
1997	22349.203584169172
1998	23844.751425190905
1999	25578.075745948627
2000	27559.027837235044
2001	29527.436870286747
2002	33234.927831819194
2003	35499.80823013511
2004	38735.65050223314
2005	43547.16153037235
2006	53231.50955327817
2007	56357.03193304805
2008	63762.32563407546
2009	68527.45086621039
2010	73140.25762168839
2011	77444.0105184013
2012	83582.42851223893
2013	86874.8024809823
2014	91606.03801052866
2015	93739.13721242195
2016	98593.9462413469
2017	104188.61481401631
2018	111683.43863498764
2019	118014.96399343827
2020	129867.13994076553