Year	Number of
1990	705.87
1991	738.65
1992	768.8
1993	797.92
1994	829.78
1995	867.57
1996	892.96
1997	923.95
1998	959.27
1999	996.05
2000	1032.08
2001	1052.2
2002	1070.19
2003	1087.15
2004	1101.56
2005	1114.4
2006	1120.71
2007	1126.01
2008	1134.8
2009	1153.63
2010	1186.4
2011	1189.46
2012	1205.94
2013	1230.63
2014	1251.89
2015	1264.36
2016	1260.64