Year	Number of
1990	615.76
1991	634.49
1992	626.13
1993	675.75
1994	680.95
1995	656.63
1996	607.9
1997	569.29
1998	553.69
1999	541.93
2000	525.07
2001	544.09
2002	532.02
2003	523.54
2004	519.44
2005	543.84
2006	543.57
2007	558.81
2008	514.17
2009	466.35
2010	467.14
2011	452.95
2012	444.05
2013	443.87
2014	424.07
2015	417.24
2016	414.72