Year	Number of
1990	3363.23
1991	3343.34
1992	3328.53
1993	3299.03
1994	3303.97
1995	3323.58
1996	3322.34
1997	3243.59
1998	3228.33
1999	3214.14
2000	3206.17
2001	3203.79
2002	3249.49
2003	3272.83
2004	3287.28
2005	3274.4
2006	3264.09
2007	3295.39
2008	3289.03
2009	3278.55
2010	3270.51
2011	3265
2012	3297.89
2013	3323.79
2014	3339.49
2015	3383.29
2016	3435.13