Passage: Ashkelon was formally granted to Israel The average tariff rate on dutiable imports  increased from 40.1% in 1929 to 59.1% in 1932 (+19%). However, it was already consistently at high level between 1865 and 1913 (from 38% to 52%). Moreover, It had also risen sharply in 1861 (from 18.61% to 36.2%; +17.6), between 1863 and 1866 (from 32.62% to 48.33%; +15.7%), between 1920 and 1922 (from 16.4% to 38.1%; +21.7%), without producing global depressions.
How many percent difference is there between the lowest and highest average tarriff rate? How many years did it take the tariff rate on imports to increase 19% after 1929? In which year was the average tariff rate at its lowest? In which years was the tariff rate over 50%?