Year	Number of
1990	205.17
1991	209.75
1992	216.31
1993	222.76
1994	230.22
1995	237.07
1996	240.55
1997	245
1998	253.78
1999	263.9
2000	268.28
2001	267.6
2002	268.04
2003	271.24
2004	273.06
2005	276.13
2006	274.87
2007	271.45
2008	267.12
2009	264.84
2010	265.09
2011	267
2012	269.26
2013	271.76
2014	274.5
2015	277.22
2016	280.56