Year	Number of
1990	3854.87
1991	3762.69
1992	3663.21
1993	3564.41
1994	3511.26
1995	3417.78
1996	3300.15
1997	3209.88
1998	3146.07
1999	3070.62
2000	2961.69
2001	2883.7
2002	2816.72
2003	2750.88
2004	2678.83
2005	2632.66
2006	2590.38
2007	2554.74
2008	2542.68
2009	2531.26
2010	2512.63
2011	2503.59
2012	2489.47
2013	2477.68
2014	2445.28
2015	2443.94
2016	2444.6