Year	Number of
1990	213.24
1991	216.57
1992	218.61
1993	219.95
1994	221.86
1995	224.95
1996	228.46
1997	232.95
1998	238.17
1999	243.36
2000	248.04
2001	256.76
2002	264.95
2003	273.43
2004	281.13
2005	288.55
2006	293.93
2007	299.37
2008	305.9
2009	315.67
2010	329.7
2011	334.94
2012	344.3
2013	357.3
2014	369.25
2015	378.48
2016	383.16