Year	Number of
1990	340.86
1991	342.45
1992	356.15
1993	350.57
1994	329.45
1995	338.22
1996	355.93
1997	356.34
1998	362.8
1999	349.95
2000	334.35
2001	342.31
2002	334.43
2003	344.39
2004	346.43
2005	358.02
2006	365.96
2007	356.52
2008	366.95
2009	361.37
2010	360.56
2011	351.9
2012	345.3
2013	326.5
2014	311.83
2015	320.11
2016	322.79