Year	Number of
1990	216.69
1991	216.81
1992	220.74
1993	225.05
1994	231.61
1995	234.08
1996	234.86
1997	237.51
1998	258.31
1999	273.99
2000	315.67
2001	319.94
2002	336.27
2003	367.38
2004	373.27
2005	382.56
2006	377.69
2007	380.76
2008	398.59
2009	395.08
2010	403.09
2011	393.14
2012	395.98
2013	402.05
2014	400.19
2015	397.94
2016	394.33