Year	Number of
1990	277.77
1991	281.58
1992	279.72
1993	304.39
1994	312.28
1995	317.34
1996	328.02
1997	331.34
1998	339.51
1999	346.74
2000	347.99
2001	350.13
2002	355.53
2003	358.56
2004	361.03
2005	364.98
2006	369.18
2007	369.4
2008	368.5
2009	372.37
2010	382.76
2011	387.12
2012	386.33
2013	395.87
2014	401.55
2015	409.31
2016	417.35