Year	Number of
1990	125.24
1991	131.1
1992	136.89
1993	143.11
1994	148.92
1995	154.9
1996	160.95
1997	167.19
1998	174.02
1999	181.3
2000	188.14
2001	194.27
2002	200.37
2003	207.67
2004	216.24
2005	225.49
2006	232.84
2007	240.48
2008	248.7
2009	258.26
2010	269.12
2011	278.33
2012	288.64
2013	299.15
2014	310.4
2015	322.06
2016	333.71