Year	Number of
1990	16178.65
1991	16561.16
1992	17965.61
1993	21174.31
1994	23101.42
1995	22112.97
1996	20779.92
1997	19965.07
1998	20032.76
1999	21722.77
2000	22638.39
2001	23094.71
2002	23804.87
2003	24414.5
2004	24466.28
2005	24934.02
2006	23665.36
2007	23300.78
2008	23764.06
2009	23145.86
2010	23350.5
2011	22889.13
2012	22256.81
2013	22092.68
2014	22287.17
2015	22679.66
2016	23533.88