Year	Number of
1990	228.17
1991	235.61
1992	244.12
1993	253.26
1994	262.2
1995	270.55
1996	276.06
1997	279.42
1998	282.18
1999	285.49
2000	288.29
2001	289.91
2002	291.33
2003	293.31
2004	296.92
2005	301.29
2006	304.21
2007	305.85
2008	307.28
2009	308.33
2010	309.63
2011	311.4
2012	316.18
2013	321.71
2014	327.24
2015	332.5
2016	338.78