Year	Number of
1990	280.43
1991	296.18
1992	303.14
1993	310.18
1994	316.17
1995	321.97
1996	332.04
1997	345.2
1998	354.67
1999	364.92
2000	363.78
2001	363.11
2002	362.96
2003	371.98
2004	378.59
2005	383.32
2006	380.7
2007	388.64
2008	387.38
2009	386.95
2010	385.34
2011	381.85
2012	384.03
2013	380.23
2014	367.54
2015	378.6
2016	382.97