Year	Number of
1990	852.72
1991	867
1992	879.05
1993	902.39
1994	916.51
1995	947.92
1996	973.96
1997	991.56
1998	1009.42
1999	1021.53
2000	1027.77
2001	1049.33
2002	1060.85
2003	1077.66
2004	1093.25
2005	1109.75
2006	1131.54
2007	1161.43
2008	1167.88
2009	1180.99
2010	1194.02
2011	1215.66
2012	1236.29
2013	1250.13
2014	1276.8
2015	1319.28
2016	1363.11