Year	Number of
1990	2327.47
1991	2375.94
1992	2446.32
1993	2543.88
1994	2527.58
1995	2522.14
1996	2460.09
1997	2377.87
1998	2337.43
1999	2286.81
2000	2186.93
2001	2132.49
2002	2112.21
2003	2005.88
2004	1983.97
2005	1937.87
2006	1845.17
2007	1735.44
2008	1717.37
2009	1683.15
2010	1656.17
2011	1627.1
2012	1520.64
2013	1455.48
2014	1404.69
2015	1413.99
2016	1431.36