Year	Number of
1990	141.12
1991	143.69
1992	146.42
1993	148.92
1994	151.58
1995	153.67
1996	158.82
1997	166.89
1998	176.08
1999	188.41
2000	205.09
2001	219.44
2002	233.81
2003	252.73
2004	274.75
2005	296.67
2006	317.99
2007	337.94
2008	350.62
2009	366.3
2010	379.53
2011	390.25
2012	401.81
2013	415.29
2014	428.99
2015	443.49
2016	457.09