Year	Number of
1990	2158.44
1991	2221.33
1992	2282.56
1993	2406.03
1994	2472.7
1995	2576.89
1996	2659.52
1997	2684.39
1998	2744.97
1999	2783
2000	2815.15
2001	2863.95
2002	2927.81
2003	3003.45
2004	3040.88
2005	3131.88
2006	3177.6
2007	3184.47
2008	3198.2
2009	3227.01
2010	3277.62
2011	3264.65
2012	3265.71
2013	3265.17
2014	3196.71
2015	3175.73
2016	3163.59