Year	Number of
1990	201.7
1991	208.52
1992	219.35
1993	229
1994	243.21
1995	252.46
1996	260.91
1997	267.59
1998	272.53
1999	284.61
2000	294.37
2001	303.92
2002	307.7
2003	313.48
2004	322.07
2005	327.67
2006	338.67
2007	344.58
2008	345.59
2009	352.15
2010	356.93
2011	358.06
2012	367.53
2013	366.18
2014	373.04
2015	374.74
2016	376.26