Year	Number of
1990	344.34
1991	351.86
1992	374.13
1993	387.51
1994	407.74
1995	406.59
1996	408.18
1997	418.66
1998	433.1
1999	445.99
2000	467.61
2001	490.02
2002	514.82
2003	551.67
2004	572.23
2005	598.19
2006	616.33
2007	630.61
2008	636.53
2009	640.82
2010	646.45
2011	643.58
2012	662.1
2013	638.84
2014	643.65
2015	651.66
2016	652.89