Year	Number of
1990	181.82
1991	184.61
1992	187.6
1993	190.28
1994	192.56
1995	194.58
1996	203.44
1997	212.37
1998	222.02
1999	233.02
2000	245.94
2001	273.88
2002	306.71
2003	345.21
2004	389.53
2005	440.44
2006	467.89
2007	497.05
2008	531.38
2009	569.12
2010	611.17
2011	625.83
2012	642.31
2013	662.81
2014	684.81
2015	708.34
2016	732.78