Year	Number of
1990	200.71
1991	198.7
1992	201.37
1993	205.59
1994	209.08
1995	206.86
1996	218.13
1997	223.61
1998	224.83
1999	233.4
2000	237.79
2001	243.33
2002	250.9
2003	258.48
2004	268.97
2005	270.74
2006	276.13
2007	285.66
2008	295.35
2009	305.03
2010	316.05
2011	325.73
2012	333.37
2013	337.28
2014	345.68
2015	355.01
2016	365.54