Year	Number of
1990	267.07
1991	331.86
1992	413.45
1993	516.01
1994	645.39
1995	809.07
1996	922.52
1997	1053.44
1998	1204.59
1999	1379.21
2000	1581.62
2001	1503.01
2002	1429.99
2003	1361.95
2004	1298
2005	1238.62
2006	1360.14
2007	1492.91
2008	1644.81
2009	1813.35
2010	2001.01
2011	2048.23
2012	2102.59
2013	2158.84
2014	2217.9
2015	2279.12
2016	2344.87