Year	Number of
1990	95.98
1991	101.38
1992	107.45
1993	114.17
1994	121.45
1995	129.2
1996	135.41
1997	141.96
1998	148.76
1999	155.56
2000	162.34
2001	170.42
2002	178.72
2003	187.42
2004	197.07
2005	207.94
2006	216.58
2007	226.25
2008	237.16
2009	248.86
2010	261.25
2011	274.63
2012	288.78
2013	303.82
2014	319.48
2015	335.81
2016	353.3