Year	Number of
1990	936.41
1991	913.44
1992	895.41
1993	880.77
1994	868.05
1995	856.71
1996	869.19
1997	884.19
1998	900.88
1999	919.97
2000	942.17
2001	963.05
2002	987.71
2003	1015.3
2004	1046.28
2005	1081.36
2006	1115.99
2007	1153.49
2008	1195
2009	1239.57
2010	1287.92
2011	1329.61
2012	1375.32
2013	1423.03
2014	1473.69
2015	1527.53
2016	1588.87