Year	Number of
1990	2256.5
1991	2304.23
1992	2313.09
1993	2336.02
1994	2364.82
1995	2399.22
1996	2424.24
1997	2467.86
1998	2509.56
1999	2540.52
2000	2566.75
2001	2590.77
2002	2636.89
2003	2649.06
2004	2643.55
2005	2621.8
2006	2599.67
2007	2576.02
2008	2579.74
2009	2596.93
2010	2582.63
2011	2537.94
2012	2517.86
2013	2488.11
2014	2452.25
2015	2418.46
2016	2466.65