Year	Number of
1990	341.71
1991	345.11
1992	354.45
1993	375.22
1994	393.81
1995	413.51
1996	415.36
1997	406.78
1998	397.09
1999	393.35
2000	397.2
2001	398.43
2002	400.9
2003	400.77
2004	404.34
2005	403.59
2006	409.69
2007	413.41
2008	422.76
2009	428.09
2010	430.38
2011	432.25
2012	432.91
2013	434.73
2014	436.29
2015	438.52
2016	441.32