Year	Number of
1990	125.15
1991	130.44
1992	136.03
1993	142.9
1994	150.39
1995	158.23
1996	166.64
1997	175.58
1998	186.57
1999	198.73
2000	204.93
2001	212.09
2002	218.45
2003	225.32
2004	233.75
2005	242.59
2006	256.6
2007	270.12
2008	287.99
2009	300.6
2010	313.62
2011	327.36
2012	335.47
2013	341.69
2014	351.17
2015	362.12
2016	374.94