Year	Number of
1990	345.28
1991	356.21
1992	377.95
1993	388.57
1994	386.75
1995	364.73
1996	351.91
1997	331.43
1998	322.55
1999	321.27
2000	311.65
2001	311.78
2002	307.97
2003	313.12
2004	316.13
2005	325.83
2006	329.76
2007	327
2008	333.93
2009	332.18
2010	326.51
2011	324.78
2012	313.24
2013	302.51
2014	302.92
2015	308.38
2016	302.39