Year	Number of
1990	306.89
1991	311.08
1992	316.55
1993	326.8
1994	337.59
1995	346.19
1996	351.67
1997	355.55
1998	361.59
1999	367.48
2000	373.18
2001	375.67
2002	378.12
2003	379
2004	380.38
2005	379.51
2006	375.34
2007	373.01
2008	371.72
2009	373.6
2010	378.23
2011	378.5
2012	379.04
2013	381.13
2014	384.3
2015	387.99
2016	392.33