Year	Number of
1990	2577.71
1991	2575.71
1992	2570.63
1993	2564.82
1994	2564.68
1995	2572.74
1996	2559.11
1997	2548.59
1998	2540.67
1999	2532.02
2000	2520.89
2001	2495.79
2002	2465.7
2003	2432.08
2004	2413.15
2005	2406.33
2006	2391.63
2007	2375.82
2008	2359.63
2009	2346.92
2010	2338.35
2011	2378.95
2012	2416.75
2013	2453.63
2014	2499.93
2015	2554.63
2016	2611.07