Table: population_trends
Columns: period
live_births_per_year
deaths_per_year
natural_change_per_year
cbr
cdr
nc
tfr
imr
life_expectancy_total
life_expectancy_males
life_expectancy_females

Question: How many imr* have 64.3 life expectancy males?
SQL: SELECT MIN("imr") FROM population_trends WHERE "life_expectancy_males" = '64.3'

Question: How many imr* have tfr* of 4.31?
SQL: SELECT "imr" FROM population_trends WHERE "tfr" = '4.31'

Question: How many deaths per year have 66.3 as the life expectancy females?
SQL: SELECT "deaths_per_year" FROM population_trends WHERE "life_expectancy_females" = '66.3'

Question: How many imr* have tfr* 5.35?
SQL: SELECT COUNT("imr") FROM population_trends WHERE "tfr" = '5.35'