Year	Number
1996	8390.48
1997	8740.54
1998	8511.28
1999	8493.43
2000	9345.74
2001	9369.95
2002	9681.29
2003	9869.05
2004	10407.28
2005	10496.29
2006	11141.79
2007	11168.62
2008	11351.67
2009	11158.39
2010	10885.13
2011	11245
2012	11528.17
2013	11289.65
2014	11986.41
2015	12046.16
2016	12252.68
2017	12322.35
2018	12459.05
2019	13090.78
2020	13955.4