Year	Number of
1990	224.42
1991	216.99
1992	224.71
1993	212.38
1994	200.07
1995	205.28
1996	209.85
1997	205.9
1998	208.94
1999	195.92
2000	188.52
2001	190.62
2002	178.94
2003	185.64
2004	184.97
2005	191.26
2006	193.11
2007	188.14
2008	191.78
2009	189.73
2010	191.21
2011	188.46
2012	186.94
2013	184
2014	181.08
2015	188.16
2016	185.34