Year	Number of
1990	1086.34
1991	1085.56
1992	1101.02
1993	1114.15
1994	1140.67
1995	1156.22
1996	1173.76
1997	1192.38
1998	1216.97
1999	1259.66
2000	1271.2
2001	1274.35
2002	1276.37
2003	1268.99
2004	1228.48
2005	1231.37
2006	1275.53
2007	1308.97
2008	1324.39
2009	1362.5
2010	1400.33
2011	1417.51
2012	1441.75
2013	1476.76
2014	1510.64
2015	1544.2
2016	1585.84