Year	Number of
1990	1344.83
1991	1366.97
1992	1376.55
1993	1381.26
1994	1370.57
1995	1388.41
1996	1397.57
1997	1406.57
1998	1422.9
1999	1441.7
2000	1446.2
2001	1466.78
2002	1489.88
2003	1512.11
2004	1531.24
2005	1542.27
2006	1551.29
2007	1566.1
2008	1585.28
2009	1592.08
2010	1587.54
2011	1583.59
2012	1589.96
2013	1598.98
2014	1615.29
2015	1669.79
2016	1720.48