Year	Number of
1990	1082.36
1991	1089.35
1992	1100.95
1993	1108.28
1994	1105.37
1995	1125.32
1996	1139.63
1997	1162.16
1998	1191.35
1999	1214.32
2000	1239.91
2001	1255.12
2002	1256.43
2003	1286.32
2004	1304.88
2005	1323.17
2006	1341.25
2007	1368.17
2008	1385.09
2009	1413.51
2010	1415.52
2011	1422.17
2012	1433.93
2013	1399.81
2014	1373.54
2015	1394.68
2016	1407.29