Year	Number of
1990	1213.09
1991	1235.3
1992	1263.1
1993	1292.53
1994	1291.05
1995	1293.35
1996	1295.23
1997	1318.72
1998	1343.49
1999	1371.27
2000	1394.75
2001	1439.02
2002	1466.02
2003	1453.77
2004	1448.02
2005	1458.46
2006	1483.96
2007	1519.65
2008	1534.89
2009	1561.4
2010	1611.25
2011	1650.13
2012	1677.41
2013	1689.46
2014	1673.94
2015	1676.67
2016	1687.5