Year	Number of
1990	282.68
1991	286.34
1992	291.07
1993	295.19
1994	299.36
1995	303.19
1996	306.96
1997	300.29
1998	294.66
1999	286.41
2000	281.85
2001	273.2
2002	270.41
2003	272.39
2004	278.58
2005	284.22
2006	288.74
2007	292.02
2008	299.24
2009	308.85
2010	324.04
2011	337.57
2012	350.25
2013	362.48
2014	376.4
2015	390.75
2016	404.19