Year	Number of
1990	440.56
1991	459.07
1992	478.96
1993	500.37
1994	522.87
1995	546.58
1996	555.72
1997	565.25
1998	575.02
1999	585.09
2000	595.65
2001	612.34
2002	630.23
2003	652.59
2004	675.22
2005	697.12
2006	714.84
2007	732.38
2008	753.13
2009	775.92
2010	801.45
2011	822.07
2012	845
2013	866.88
2014	890.13
2015	914.59
2016	939.35