Year	Number of
1990	186.14
1991	192.34
1992	198.84
1993	206.29
1994	214.17
1995	222.48
1996	235.83
1997	249.9
1998	265.08
1999	281.13
2000	298.15
2001	315.84
2002	334.67
2003	354.7
2004	375.99
2005	398.64
2006	418.35
2007	439.1
2008	461
2009	484.33
2010	509.23
2011	529.55
2012	551.24
2013	574.69
2014	599.41
2015	625.35
2016	653.22