Year	Number of
1990	964.91
1991	992.04
1992	1017.56
1993	1043.41
1994	1035.29
1995	1051.44
1996	1069.71
1997	1087.79
1998	1116.9
1999	1123.45
2000	1152.16
2001	1153.15
2002	1180.85
2003	1175.73
2004	1166.58
2005	1155.35
2006	1154.55
2007	1144.28
2008	1140.91
2009	1149.46
2010	1153.27
2011	1154.16
2012	1150.31
2013	1153.06
2014	1157.16
2015	1170.04
2016	1198.98