Year	Number of
1990	1467.41
1991	1459.47
1992	1429.59
1993	1576.59
1994	1701.99
1995	1783.09
1996	2253.57
1997	2188.42
1998	2208.23
1999	2203.38
2000	2202.35
2001	2210.07
2002	2214.98
2003	2223.25
2004	2234.69
2005	2250.01
2006	2259.62
2007	2267.37
2008	2276.46
2009	2297.82
2010	2313.93
2011	2325.42
2012	2337.73
2013	2357.08
2014	2378.56
2015	2402.92
2016	2427.97