Year	Number
1996	5040.7
1997	5389.78
1998	5770.4
1999	6742.31
2000	6815.4
2001	8591.94
2002	10971.39
2003	13463.11
2004	16025.99
2005	17794.68
2006	19561.21
2007	21637.21
2008	22022.16
2009	25022.23
2010	26424.46
2011	27180.38
2012	28322.28
2013	30326.35
2014	31004.71
2015	32968.6
2016	35162.5
2017	33239.62
2018	33686.23
2019	37430.02
2020	42623.31