Year	Number of
1990	2308.01
1991	2223.77
1992	2292.87
1993	2285.03
1994	2291.89
1995	2376.66
1996	2331.93
1997	2323.07
1998	2309.79
1999	2345.89
2000	2455.92
2001	2499.57
2002	2558.12
2003	2565.52
2004	2567.43
2005	2608.11
2006	2587.05
2007	2575.22
2008	2597.83
2009	2602.37
2010	2672.32
2011	2638.92
2012	2674.1
2013	2706.04
2014	2735.67
2015	2765.13
2016	2798.9