Year	Number of
1990	2176.57
1991	2223.94
1992	2255.84
1993	2279.62
1994	2313.98
1995	2339.24
1996	2367.83
1997	2369.43
1998	2392.11
1999	2421.18
2000	2445.76
2001	2433.79
2002	2423.2
2003	2439.64
2004	2450.45
2005	2465.03
2006	2476.7
2007	2467.68
2008	2468.41
2009	2464.49
2010	2466.89
2011	2438.5
2012	2428.5
2013	2416.08
2014	2422.25
2015	2443.52
2016	2462.69