Year	Number of
1990	1085.55
1991	1098.86
1992	1062.36
1993	1036.67
1994	1038.27
1995	1062.18
1996	1105.32
1997	1145.5
1998	1181.17
1999	1202.92
2000	1181.92
2001	1138.33
2002	1093.29
2003	1055.93
2004	1020.22
2005	992.01
2006	980.67
2007	975.8
2008	983.28
2009	998.75
2010	1025.31
2011	1048.02
2012	1075.01
2013	1117.01
2014	1158.18
2015	1202.17
2016	1248.62