local function GetPercentageIncrease(initial_value, final_value)
    return ((final_value - initial_value) / math.abs(initial_value)) * 100
end

local function GetPercentageDecrease(initial_value, final_value)
    return ((initial_value - final_value) / math.abs(initial_value)) * 100
end

print("Percentage Increase Value: " .. GetPercentageIncrease(16, 18.4) .. "%")

print("Percentage Decrease Value: " .. GetPercentageDecrease(1445, 1300) .. "%")