Year	Number of
1990	506.69
1991	519.01
1992	525.62
1993	556.05
1994	566.55
1995	573.53
1996	573.99
1997	570.34
1998	589.23
1999	629.93
2000	642.95
2001	672.34
2002	697.01
2003	713.72
2004	734.82
2005	748.83
2006	759.49
2007	768.98
2008	778.59
2009	787.49
2010	795.55
2011	811.64
2012	828.33
2013	846.06
2014	861.69
2015	878.2
2016	891.17