"A consultation document says the birth rate in Currie Primary’s catchment has increased from 40 in 2011 to 60 in 2016."
When I'm in charge, journalists will be forced to explicitly state the units of the data they're reporting, as well as any other data required for context.
I presume this is "40 births per thousand population", rather than just "40 births in 2011". So what's the population of the catchment area? Has it steadily increased over the last five years, or are 2011 and 2016 extreme outliers?