Year	Number of
1990	2679.5
1991	2684.43
1992	2766.89
1993	2826.21
1994	2890.82
1995	2898.45
1996	2868.02
1997	2852.12
1998	2805.6
1999	2743.63
2000	2727.81
2001	2750
2002	2794.91
2003	2875.42
2004	2955.14
2005	3082.68
2006	3128.78
2007	3141.76
2008	3144.25
2009	3123.74
2010	3122.07
2011	3085.87
2012	3053.11
2013	3021.32
2014	2958.62
2015	2927.34
2016	2905.26