Year	Number of
1990	251.46
1991	261.96
1992	273.59
1993	289.07
1994	299.64
1995	308.82
1996	317.53
1997	320.68
1998	320.18
1999	325.22
2000	314.68
2001	308.62
2002	304.57
2003	304.53
2004	304.85
2005	309.93
2006	317.56
2007	319.75
2008	326.74
2009	333.03
2010	337.55
2011	341.47
2012	349.98
2013	357.44
2014	364.68
2015	373.14
2016	383