Year	Number of
1990	124.46
1991	133.58
1992	145.71
1993	160.53
1994	175.83
1995	190.68
1996	199.16
1997	205.51
1998	210.56
1999	215.23
2000	221.67
2001	229.63
2002	239.95
2003	252.61
2004	265.37
2005	277.82
2006	289.55
2007	300.68
2008	311.77
2009	323.82
2010	337.14
2011	350.07
2012	365.81
2013	384.01
2014	402.43
2015	420.59
2016	440.36