Year	Number of
1990	366.38
1991	348.6
1992	329.73
1993	309.96
1994	291.45
1995	274.81
1996	271.05
1997	267.97
1998	265.62
1999	263.49
2000	261.41
2001	269.77
2002	278.28
2003	288.68
2004	298.71
2005	308.37
2006	318.36
2007	328.08
2008	338.17
2009	349.17
2010	361.36
2011	364.54
2012	368.45
2013	371.08
2014	373.89
2015	377.11
2016	384.47