Year	Number of
1990	207.56
1991	209.56
1992	216.35
1993	221.37
1994	230.21
1995	241.11
1996	251.56
1997	256.36
1998	263.32
1999	267.63
2000	275.17
2001	273.67
2002	280.27
2003	285.19
2004	297.65
2005	310.58
2006	313.09
2007	314.23
2008	318.55
2009	328.95
2010	336.96
2011	347.47
2012	351.57
2013	367.07
2014	373.53
2015	382.76
2016	391.23