Year	Number of
1990	1196.14
1991	1220.78
1992	1266.08
1993	1287.14
1994	1312.81
1995	1336.91
1996	1359.49
1997	1405.76
1998	1456.28
1999	1509.2
2000	1534.08
2001	1545.68
2002	1551.67
2003	1560.72
2004	1593.96
2005	1638.28
2006	1659.19
2007	1652.91
2008	1633.75
2009	1623.59
2010	1615.88
2011	1607.42
2012	1608.11
2013	1628.23
2014	1651.75
2015	1666.78
2016	1678.64