Having been suppressed for so long, when countries are liberated from dictatorial or colonial rule, they prefer stability to economic growth. Thus political parties that provide for such stability tend to reap benefits of continuing at the top for some time.
In India, and now in South Africa these honeymoons have lasted over two decades (longer than most places). From 1950 to 1977 Congress party ruled India even though India grew at only 3% per annum (dubbed the Hindu rate of growth). Similarly, since the end of apartheid in South Africa the ANC has ruled with only modest (now 3%) growth figures to boast of.
From Ruchir Sharma’s Breakout Nations