Year	Number of
1990	976.88
1991	1003.66
1992	1032.96
1993	1064.23
1994	1097.48
1995	1133.4
1996	1147.53
1997	1163.55
1998	1181.09
1999	1200
2000	1221.39
2001	1221.6
2002	1223.82
2003	1227.28
2004	1232.24
2005	1239.88
2006	1255.33
2007	1271.85
2008	1291.52
2009	1312.79
2010	1336.55
2011	1363.94
2012	1394.24
2013	1425.87
2014	1459.59
2015	1495.42
2016	1534.1