Year	Number of
1990	476.8
1991	496.11
1992	515.99
1993	536.88
1994	559.1
1995	583.11
1996	605.08
1997	629.11
1998	655.7
1999	683.22
2000	711.67
2001	743.22
2002	776.4
2003	812.57
2004	851.07
2005	892.45
2006	931.51
2007	972.99
2008	1018.2
2009	1067.94
2010	1122.88
2011	1171.36
2012	1224.95
2013	1281.72
2014	1341.62
2015	1404.16
2016	1466.69