Year	Number of
1990	367.64
1991	353.98
1992	351.52
1993	373.7
1994	390.29
1995	374.48
1996	323.24
1997	316.79
1998	325.32
1999	307.49
2000	289.59
2001	301.44
2002	284.72
2003	282.6
2004	273.06
2005	270.5
2006	284.65
2007	270.01
2008	255.02
2009	247.97
2010	237.79
2011	230.76
2012	218.07
2013	225.59
2014	214.84
2015	211.99
2016	210.46