irr_date	irr_amount	irr_unit
1982-05-17	20	mm
1982-05-29	30	mm
1982-06-02	30	mm
1982-06-15	30	mm
1982-06-22	30	mm
1982-07-04	30	mm
1980-05-16	20	mm
1980-05-23	20	mm
1980-05-29	25	mm
1980-06-10	30	mm
1979-05-17	20	mm
1979-05-25	25	mm
1979-06-05	30	mm
1979-06-25	30	mm
1979-07-04	30	mm