Year	Number of
1990	196.19
1991	209.65
1992	226.39
1993	239.7
1994	255.08
1995	264.07
1996	274.79
1997	283.05
1998	281.44
1999	281.06
2000	279.74
2001	279.52
2002	286.1
2003	293.57
2004	296.18
2005	300.86
2006	303.84
2007	305.42
2008	308.81
2009	307.59
2010	309.41
2011	308.23
2012	314.52
2013	326.07
2014	333.85
2015	340.73
2016	348.2