Year	Number of
1990	1592.51
1991	1559.12
1992	1534.25
1993	1511.33
1994	1498.47
1995	1484.96
1996	1479.15
1997	1474.55
1998	1476.38
1999	1477.26
2000	1471.66
2001	1477.6
2002	1490.21
2003	1499.59
2004	1501.49
2005	1511.66
2006	1524.61
2007	1541.29
2008	1559.23
2009	1576.87
2010	1597.09
2011	1621.57
2012	1649.25
2013	1662.61
2014	1670.96
2015	1702.55
2016	1736.58