Year	Number of
1990	12943.01
1991	13366.53
1992	14700.55
1993	17114.49
1994	18330.98
1995	17607.02
1996	16552.06
1997	15704.3
1998	15527.5
1999	16300.12
2000	17012.37
2001	17205.95
2002	17668.1
2003	17900.25
2004	17877
2005	18228.59
2006	17648.84
2007	17728.55
2008	18148.66
2009	17737.48
2010	17946.68
2011	17773.02
2012	17548.35
2013	17730.63
2014	18043.44
2015	18512.03
2016	18924.59