Year	Number of
1987	2998
1988	2970
1989	2950
1990	2949
1991	2960
1992	2999
1993	3041
1994	3059
1995	3062
1996	3035
1997	2992
1998	2941
1999	2895
2000	2848
2001	2821
2002	2810
2003	2799
2004	2818
2005	2825
2006	2826
2007	2804
2008	2782
2009	2752
2010	2719
2011	2686
2012	2651
2013	2626
2014	2608
2015	2586