Year	Number of
1990	216.67
1991	224.46
1992	232.46
1993	240.03
1994	248.04
1995	256.7
1996	262.56
1997	275.43
1998	270.79
1999	275.51
2000	289.56
2001	282.93
2002	299.88
2003	309.05
2004	315.11
2005	321.49
2006	327.17
2007	331.89
2008	351.68
2009	348.77
2010	358.19
2011	363.45
2012	368.75
2013	374.67
2014	383
2015	391.76
2016	401.43