Year	Number of
1990	1273.84
1991	1314
1992	1355.52
1993	1399.21
1994	1446.89
1995	1491.05
1996	1538.11
1997	1584.59
1998	1633.54
1999	1664.55
2000	1698.84
2001	1725.76
2002	1754.91
2003	1784.48
2004	1810.26
2005	1832.52
2006	1842.96
2007	1854.62
2008	1871.96
2009	1893.77
2010	1917.38
2011	1938.72
2012	1960.31
2013	1982.57
2014	2011.82
2015	2046.34
2016	2080.01