Year	Number of
1990	1384.76
1991	1392.08
1992	1397.19
1993	1400.45
1994	1387.94
1995	1395.79
1996	1398.47
1997	1396.13
1998	1410.02
1999	1450.42
2000	1476.25
2001	1501.98
2002	1517.32
2003	1528.34
2004	1565.15
2005	1566.31
2006	1568.38
2007	1587.35
2008	1585.4
2009	1569.62
2010	1551.78
2011	1550.08
2012	1568.71
2013	1568.68
2014	1559.3
2015	1570.48
2016	1583.76