Year	Number of
1990	552.95
1991	564.98
1992	579.53
1993	597.54
1994	619.35
1995	644.23
1996	667.38
1997	694.41
1998	722.13
1999	750.72
2000	785.45
2001	818.43
2002	847.43
2003	875.75
2004	927.85
2005	974.02
2006	1011.86
2007	1052.58
2008	1095.32
2009	1129.66
2010	1169.02
2011	1210.63
2012	1255.29
2013	1304.44
2014	1355.6
2015	1410.47
2016	1467.58