Year	Number of
1990	1048.24
1991	1036.11
1992	996.07
1993	1133.07
1994	1233.63
1995	1311.02
1996	1371.2
1997	1400.51
1998	1406.59
1999	1424.56
2000	1436.96
2001	1439.15
2002	1448.87
2003	1463.55
2004	1518.35
2005	1577.88
2006	1606.38
2007	1584.37
2008	1544.02
2009	1510.79
2010	1488.68
2011	1470.71
2012	1453.56
2013	1400.38
2014	1345.58
2015	1326.4
2016	1352.02