Year	Number of
1990	1157.94
1991	1173.4
1992	1201.37
1993	1206.72
1994	1233.67
1995	1238.04
1996	1312.32
1997	1415.01
1998	1476.6
1999	1559.68
2000	1659.15
2001	1608.93
2002	1591.63
2003	1601.23
2004	1620.52
2005	1640.81
2006	1677.68
2007	1706.1
2008	1732.33
2009	1766.95
2010	1802.97
2011	1852.87
2012	1897.36
2013	1952.69
2014	2024.29
2015	2099
2016	2173.12