Year	Total
1991	15842860000
1992	15842860000
1993	15696912000
1994	15696912000
1995	15496404000
1996	15496404000
1997	15428204000
1998	15428204000
1999	15291804000
2000	15291804000
2001	15181320000
2002	14960352000
2003	14699828000
2004	14384744000
2005	14240160000
2006	14189692000
2007	14517052000
2008	14508868000
2009	14398384000
2010	14431120000
2011	14418844000
2012	14388836000
2013	14324728000
2014	14071024000
2015	13964632000
2016	14935800000