Year	Number of
1990	295.39
1991	288.51
1992	279.76
1993	266.17
1994	246.14
1995	237.07
1996	218.68
1997	208.48
1998	189.19
1999	182.88
2000	174.11
2001	178.71
2002	190.36
2003	202.93
2004	201.76
2005	201.2
2006	203.31
2007	203.64
2008	208.26
2009	219.44
2010	222.04
2011	223.63
2012	229.64
2013	222.39
2014	224.63
2015	212.44
2016	204.04