Year	Number of
1990	503.58
1991	514.7
1992	528.04
1993	542.07
1994	558.64
1995	567.38
1996	578.21
1997	587.61
1998	597.79
1999	606.39
2000	613.15
2001	627.86
2002	649.12
2003	680.27
2004	713.68
2005	749.89
2006	778.65
2007	802.61
2008	832.18
2009	862.66
2010	896.37
2011	930.75
2012	966.32
2013	1006.44
2014	1041.16
2015	1080.54
2016	1121.05