Year	Number of
1990	945.88
1991	981.77
1992	1008.49
1993	1043.29
1994	1083.44
1995	1110.7
1996	1146.47
1997	1165.94
1998	1213.56
1999	1259.21
2000	1300.62
2001	1333.09
2002	1359.54
2003	1381.7
2004	1418.07
2005	1446.9
2006	1482.31
2007	1519.19
2008	1555.68
2009	1603.07
2010	1645.93
2011	1656.87
2012	1668.57
2013	1663.83
2014	1650.27
2015	1635.14
2016	1621.64