Year	Number of
1990	640.62
1991	659.46
1992	678.88
1993	697.45
1994	723.6
1995	753.78
1996	781.88
1997	813.38
1998	847.79
1999	891.67
2000	934.27
2001	973.75
2002	1010.15
2003	1044.73
2004	1076.6
2005	1107.06
2006	1134.29
2007	1161.88
2008	1192.06
2009	1224.58
2010	1256.77
2011	1285.36
2012	1313.38
2013	1342.56
2014	1372
2015	1401.57
2016	1424