Year	Number of
1990	224.61
1991	225.96
1992	205.59
1993	210.95
1994	216.63
1995	215.62
1996	203.33
1997	184.29
1998	170.11
1999	167.76
2000	164.1
2001	166.44
2002	166.04
2003	170.88
2004	169.2
2005	175.42
2006	180.09
2007	184.99
2008	186.72
2009	188.26
2010	195.25
2011	182.09
2012	185.54
2013	182.52
2014	188.48
2015	189.28
2016	187.28