Year	Number of
1990	1001.25
1991	1031.55
1992	1056.11
1993	1073.46
1994	1091.75
1995	1110.13
1996	1121.86
1997	1129.43
1998	1174.3
1999	1194.94
2000	1255.36
2001	1297.99
2002	1343.67
2003	1372.45
2004	1423.41
2005	1481.02
2006	1544.3
2007	1625.72
2008	1700.19
2009	1788.34
2010	1880.69
2011	1923.25
2012	1943.53
2013	1961.65
2014	1946.31
2015	1932.32
2016	1924.19