Year	Number of
1990	2647.52
1991	2761.63
1992	2893.37
1993	3036.72
1994	3196.21
1995	3367.9
1996	3357.36
1997	3348.77
1998	3348.02
1999	3350.75
2000	3346.65
2001	3359.72
2002	3367.38
2003	3369.55
2004	3375.74
2005	3383.09
2006	3379.33
2007	3380.17
2008	3382.52
2009	3387.24
2010	3394.95
2011	3349.93
2012	3308.69
2013	3272.05
2014	3239.82
2015	3223.78
2016	3212.06