Year	Number of
1990	193.75
1991	203.69
1992	210.86
1993	218.92
1994	227.78
1995	234.41
1996	247.1
1997	260.18
1998	270.38
1999	284.12
2000	297.78
2001	307.21
2002	313.53
2003	316.86
2004	318.26
2005	320.53
2006	321.92
2007	328.35
2008	332.18
2009	334.71
2010	335.67
2011	335.59
2012	340.45
2013	356.48
2014	358.07
2015	359.17
2016	363.25