Year	Number of
1990	543.82
1991	539.51
1992	539.24
1993	529.71
1994	526.39
1995	510.69
1996	473.01
1997	438.02
1998	407.97
1999	387.28
2000	363
2001	358.25
2002	364.85
2003	365.15
2004	362.15
2005	364.43
2006	368.39
2007	362.67
2008	354.4
2009	352.78
2010	350.97
2011	352.76
2012	357.17
2013	360.27
2014	360.35
2015	357.51
2016	366.42