Year	Number of
1990	676.97
1991	662.91
1992	644.81
1993	613.52
1994	565.13
1995	543.64
1996	493.59
1997	460.15
1998	406.26
1999	380.76
2000	352.88
2001	363.23
2002	385.95
2003	407.73
2004	401.5
2005	403.71
2006	409.44
2007	409.74
2008	420.94
2009	446.32
2010	444.97
2011	445.38
2012	454.11
2013	440.62
2014	445.24
2015	423.53
2016	409.23