The population doubled by 1978, and the population growth rate peaked at 3.4% in 1985. At the 2006 census, the population had reached 298,968, although the census in 2000 showed that the population growth rate had declined to 1.9%. Life expectancy at birth stood at 46 years in 1978, and later rose to 72. Infant mortality has declined from 12.7% in 1977 to 1.2% today, and adult literacy reached 99%. Combined school enrolment reached the high 90s. The population was projected to have reached 317,280 in 2010.
By how many percentage points did the population growth decline between 1978 and 2000?
1.5