Year	Number of
1990	278.41
1991	281
1992	290.53
1993	297.57
1994	304
1995	310.34
1996	318.36
1997	327.08
1998	323.11
1999	323.27
2000	325.97
2001	310.97
2002	308.55
2003	302.41
2004	300.81
2005	304.59
2006	302.46
2007	310.27
2008	310.1
2009	319.29
2010	329.75
2011	333.77
2012	338.21
2013	344.36
2014	363.07
2015	386.88
2016	400.58