Year	Number of
1990	406.57
1991	427.4
1992	439.41
1993	444.69
1994	466.08
1995	451.97
1996	430.58
1997	402.08
1998	424.38
1999	415.29
2000	437.01
2001	455.2
2002	479.63
2003	515.73
2004	555.47
2005	584.92
2006	625.88
2007	664.94
2008	680.11
2009	705.64
2010	728.81
2011	747.15
2012	761.12
2013	770.11
2014	803.26
2015	829.48
2016	858.17