Year	Number of
1990	208.71
1991	215.43
1992	225.45
1993	235.69
1994	248.7
1995	263.82
1996	275.8
1997	288.57
1998	300.75
1999	310.47
2000	317.36
2001	315.46
2002	310.6
2003	308.89
2004	299.66
2005	292.13
2006	307.3
2007	317.09
2008	326.51
2009	337.77
2010	341.72
2011	349.02
2012	359.54
2013	370.1
2014	381.76
2015	393.26
2016	404.72