Year	Number of
1990	205.94
1991	212.35
1992	219.37
1993	226.6
1994	234.43
1995	243.1
1996	250.43
1997	258.53
1998	267.74
1999	277.9
2000	289.3
2001	300.05
2002	312
2003	325.06
2004	339.33
2005	355.34
2006	366
2007	377.24
2008	389.49
2009	402.15
2010	415.89
2011	432.45
2012	449.58
2013	468.44
2014	487.75
2015	507.56
2016	528.62