Year	Number of
1990	431.96
1991	458.72
1992	478.24
1993	501.88
1994	525.81
1995	551.57
1996	578.12
1997	608.87
1998	641.75
1999	678.87
2000	720.81
2001	756.73
2002	796.76
2003	832.46
2004	868.24
2005	908.97
2006	954.51
2007	1013.87
2008	1074.47
2009	1133.42
2010	1200.31
2011	1249.28
2012	1343.78
2013	1440.99
2014	1511.66
2015	1529.51
2016	1543.1