In the Central region, where the land area (km 2) is 8,543.2, what was the rainfall by depth (mm/year)?
create table table_25983027_1 (rainfall_by_depth__mm_year_ varchar, land_area__km_2__ varchar, PRIMARY KEY (rainfall_by_depth__mm_year_))
select rainfall_by_depth__mm_year_ from table_25983027_1 where land_area__km_2__ = "8,543.2"