Year	Number of
1990	117.26
1991	125.36
1992	136.06
1993	149.89
1994	164.12
1995	178.29
1996	186.51
1997	193.16
1998	198.44
1999	204.17
2000	211.34
2001	218.5
2002	227.41
2003	237.57
2004	247.94
2005	258.54
2006	268.69
2007	277.68
2008	286.71
2009	296.75
2010	308.78
2011	319.82
2012	332.81
2013	346.28
2014	360.37
2015	374.77
2016	394.54