How many bills where originally cosponsored in those years where the total of all amendments cosponsored was 0?
create table table_18852984_2 (bills_originally_cosponsored varchar, all_amendments_cosponsored varchar, PRIMARY KEY (bills_originally_cosponsored))
select bills_originally_cosponsored from table_18852984_2 where all_amendments_cosponsored = 0