Year	Number of
1990	19113.33
1991	20156.85
1992	21061.69
1993	21195
1994	21544.94
1995	22482.74
1996	21111.86
1997	19441.49
1998	17721.25
1999	17700.55
2000	17697.35
2001	16940.97
2002	16378.15
2003	15989.66
2004	15917.49
2005	15901.47
2006	14847.89
2007	14968.11
2008	14668.17
2009	12830.14
2010	12112.1
2011	11757.63
2012	12050.04
2013	11990.56
2014	11552.18
2015	11692.95
2016	11885.73