The oil embargo of 1973 was a politically motivated crisis. OPEC decided to cut oil production by approximately five percent. The aim was to put pressure on Western nations who were supporting Israel in the Yom Kippur War in October 1973. On 17 October 1973 the price of oil rose from around three US dollars per barrel (159 litres) to over five dollars, equivalent to an increase of approximately 70 percent. The oil crisis also had an impact on West Berlin, causing petrol shortages and rationing. The Federal Government even introduced car-free Sundays.