Year	Number of
1990	366.75
1991	358.69
1992	346.52
1993	339.62
1994	330.62
1995	328.08
1996	317.23
1997	317.46
1998	310.77
1999	306.94
2000	301.43
2001	298.23
2002	292.55
2003	292
2004	293.32
2005	293.36
2006	289.7
2007	288.77
2008	280.89
2009	284.06
2010	278.05
2011	277.22
2012	275.97
2013	274.75
2014	272.69
2015	275.67
2016	279.78