Year	Number of
1990	183.16
1991	186.51
1992	205.88
1993	208.07
1994	215.63
1995	201.93
1996	198.13
1997	192.82
1998	192.77
1999	199.37
2000	203.75
2001	207.94
2002	217.28
2003	234.26
2004	245.26
2005	252.42
2006	260.7
2007	267.27
2008	284.64
2009	291.41
2010	302.47
2011	305.85
2012	315.37
2013	326.88
2014	338.95
2015	353.15
2016	360.14