Year	Number of
1990	541.98
1991	579.22
1992	617.95
1993	659.45
1994	704.83
1995	755.5
1996	802.65
1997	854.65
1998	914.96
1999	978.89
2000	1046.73
2001	1101.83
2002	1159.59
2003	1224.68
2004	1295.82
2005	1373.93
2006	1472.08
2007	1579.67
2008	1693.3
2009	1815.47
2010	1947.49
2011	2057.61
2012	2177.84
2013	2303.14
2014	2439.93
2015	2589.21
2016	2762.34