Year	Number of
1990	257
1991	258.54
1992	264.14
1993	265.19
1994	267.86
1995	277.53
1996	282.85
1997	287.76
1998	293.34
1999	299.13
2000	304.05
2001	308.55
2002	313.43
2003	319.9
2004	325.41
2005	330.5
2006	334.62
2007	338.43
2008	343.53
2009	349.69
2010	355.85
2011	361.63
2012	368.05
2013	374.47
2014	381.64
2015	389.33
2016	397.03