Original
During 1955 to 1975, the mortgage interest rate gradually increase from 5% to 8% and then followed by a dramatic increase from 1975 to 1985 to a peak of 20%. After that, it drops sharply from 1985 to 1995 to a bottom of 8% and then it growth up to 10% in 1995. However, it drops again from 1995 to 1998.
Edit
During 1955 to 1975, the average mortgage interest rate gradually increased from 5% to 8% and then followed by a dramatic increase from 1975 to 1985 to a peak of 20%. After that, it drops dropped sharply from between 1985 to and 1995 to a reaching the bottom of at 8% and then after which it growth up rose to 10% in 1995 1996. However, it drops dropped again from 1995 (10%) to 1998 (9%).
Final
During 1955 to 1975, the average mortgage interest rate gradually increased from 5% to 8% followed by a dramatic increase from 1975 to 1985 to a peak of 20%. After that, it dropped sharply between 1985 and 1995 reaching the bottom at 8% after which it rose to 10% in 1996. However, it dropped again from 1995 (10%) to 1998 (9%).
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