Year	Number of
1990	796.74
1991	785.59
1992	782.22
1993	766.51
1994	753.04
1995	746.88
1996	740.32
1997	735.99
1998	720.76
1999	703.86
2000	685.11
2001	677.85
2002	668.93
2003	667
2004	666.29
2005	656.34
2006	643.51
2007	639.45
2008	632.91
2009	617.41
2010	598.38
2011	572.81
2012	541.61
2013	474.48
2014	526.2
2015	544.49
2016	559.89