Year	Number of
1990	1194.73
1991	1173.61
1992	1145
1993	1162.38
1994	1203.56
1995	1265.37
1996	1283.08
1997	1251.16
1998	1248.61
1999	1254.08
2000	1265.67
2001	1299.46
2002	1330.55
2003	1363.37
2004	1412.03
2005	1435
2006	1467.17
2007	1491.91
2008	1517.86
2009	1583.73
2010	1652.16
2011	1681.9
2012	1711.14
2013	1765.77
2014	1788.03
2015	1832.46
2016	1889.44