Year	Number of
1990	1194.9
1991	1231.58
1992	1308.37
1993	1390.62
1994	1448.37
1995	1477.73
1996	1498.05
1997	1509.32
1998	1506.66
1999	1519.48
2000	1520.29
2001	1531.69
2002	1559.51
2003	1586.39
2004	1596.85
2005	1602.05
2006	1577.39
2007	1569.75
2008	1605.32
2009	1676.09
2010	1726.75
2011	1742.4
2012	1743.96
2013	1730.23
2014	1712.58
2015	1763.07
2016	1813