Year	Number of
1990	1136.46
1991	1175.57
1992	1223.12
1993	1272.75
1994	1332.23
1995	1377.89
1996	1431.65
1997	1483.27
1998	1543.41
1999	1620.97
2000	1690.5
2001	1780.56
2002	1888.45
2003	2023.6
2004	2163.36
2005	2310.68
2006	2417.11
2007	2515.61
2008	2636.21
2009	2763.43
2010	2903.19
2011	3038.25
2012	3184.13
2013	3323.53
2014	3443.81
2015	3577.1
2016	3732.36