Year	Number of
1990	318.19
1991	331.13
1992	344.93
1993	359.82
1994	375.71
1995	392.81
1996	411.35
1997	431.11
1998	452.38
1999	474.88
2000	498.72
2001	522.65
2002	547.67
2003	574.6
2004	603.03
2005	633.51
2006	658.24
2007	684.07
2008	712.76
2009	742.8
2010	774.76
2011	801.13
2012	829.81
2013	860.04
2014	891.9
2015	925.43
2016	961.75