According to the 2011 census of India, the total population of Karnataka was 61,095,297 of which 30,966,657 (50.7%) were male and 30,128,640 (49.3%) were female, or 1000 males for every 973 females. This represents a 15.60% increase over the population in 2001. The population density was 319 per km2 and 38.67% of the people lived in urban areas. The literacy rate was 75.36% with 82.47% of males and 68.08% of females being literate. 84.00% of the population were Hindu, 12.92% were Muslim, 1.87% were Christian, 0.72% were Jains, 0.16% were Buddhist, 0.05% were Sikh and 0.02% were belonging to other religions and 0.27% of the population did not state their religion.. How many years was the time span where the population increased 15.60%?