Year	Number of
1990	239.2
1991	214.68
1992	205.63
1993	204.99
1994	213.24
1995	242.38
1996	237.25
1997	243.22
1998	251.81
1999	254.66
2000	268.44
2001	279.38
2002	300.92
2003	307.85
2004	317.85
2005	330.45
2006	337.04
2007	341.68
2008	350.86
2009	352
2010	352.28
2011	346.69
2012	339.28
2013	333.63
2014	328.15
2015	326.06
2016	325.5