Year	Number of
1990	259.48
1991	270.23
1992	259.84
1993	270.85
1994	274.99
1995	251.76
1996	230.3
1997	223
1998	233.17
1999	220.05
2000	219.13
2001	216.89
2002	211.47
2003	212.72
2004	207.42
2005	210.42
2006	210.06
2007	209.14
2008	203.56
2009	200.15
2010	186.87
2011	192.68
2012	195.99
2013	202
2014	204.34
2015	205.66
2016	208.83