Year	Number of
1990	43506.29
1991	43782.12
1992	44024.99
1993	44596.76
1994	44906.15
1995	45098.31
1996	44746.07
1997	44116.98
1998	43885.74
1999	43835.25
2000	43809.25
2001	43886.51
2002	43942.23
2003	43804.66
2004	43520.08
2005	43231.56
2006	42856.62
2007	42796.01
2008	43129.21
2009	43490.44
2010	43929.32
2011	44376.48
2012	44895.56
2013	45559.86
2014	46401.07
2015	47714.06
2016	48779.9