Year	Number of
1990	241.63
1991	254.8
1992	268.24
1993	280.67
1994	293.22
1995	306.78
1996	305.28
1997	306.16
1998	306.35
1999	304.74
2000	303.85
2001	314.13
2002	324.88
2003	334.92
2004	344.91
2005	355.74
2006	356.17
2007	357.36
2008	358.42
2009	359.93
2010	361.89
2011	366.24
2012	372.09
2013	377.43
2014	384.06
2015	390.96
2016	398.19