Year	Number of
1990	15088.94
1991	15632.42
1992	15494.01
1993	15227.17
1994	15368.27
1995	15897.53
1996	15653.73
1997	15882.79
1998	16031.04
1999	16796.68
2000	16527.69
2001	16509.49
2002	16517.72
2003	16565.93
2004	16818.08
2005	16871.95
2006	16957.98
2007	17079.69
2008	17026.84
2009	16956.21
2010	16885.45
2011	16789.6
2012	17016.04
2013	16886.26
2014	16389.83
2015	16244.49
2016	16153.4