Year	Number of
1990	305.37
1991	317.4
1992	330.33
1993	344.36
1994	358.82
1995	373.73
1996	385.72
1997	397.81
1998	410.46
1999	423.46
2000	436.94
2001	453.81
2002	471.95
2003	495.92
2004	520.6
2005	545.21
2006	567.17
2007	589.19
2008	614.97
2009	642.88
2010	673.63
2011	707.73
2012	745
2013	778.32
2014	813.19
2015	849.54
2016	892.65