Year	Number of
1990	1207.7
1991	1244.14
1992	1285.66
1993	1325.38
1994	1368.14
1995	1412.34
1996	1455.2
1997	1496.48
1998	1540.94
1999	1582.49
2000	1622.81
2001	1644.43
2002	1667.44
2003	1703.21
2004	1740.95
2005	1780.28
2006	1787.5
2007	1797.86
2008	1810.39
2009	1826.65
2010	1846.36
2011	1828.97
2012	1812.81
2013	1796.94
2014	1784.49
2015	1775.89
2016	1764.11