The formula to calculate GDP is:
GDP = personal consumption + gross investment + government investment + government spending + (exports – imports)
So, the GDP exceeded consumption in starting 1960s because any of personal consumption, gross investment, government investment, government spending, or (exports-imports) increased or it would be better if the way that their combination was increased in starting 1960s. The divergence happened because the personal consumption was low in the early 60s as compared to the gross investment, government investment, government spending, and (exports-imports).
as you can see, GDP and consumption lines lie practically on top of each other from...