Year	Number of
1990	167.69
1991	179.03
1992	192.99
1993	205.35
1994	214.96
1995	224.2
1996	235.92
1997	245.71
1998	260.79
1999	266.03
2000	280.35
2001	290.11
2002	311.69
2003	326.42
2004	337.6
2005	348.34
2006	361.61
2007	375.11
2008	389.28
2009	403.62
2010	418.96
2011	440.02
2012	461.03
2013	477.23
2014	498.21
2015	520.57
2016	551.04