Net income was $515, 500 in 2015, $476,000 in 2016, and $537,000 in 2017. What is the percentage of change from (a) 2015 to 2016, and (b) from 2016 to 2017? Is the change an increase or a decrease? (If amount and percentage are a decrease show the numbers as negative, e.g.-55,000, -20% or (55,000), (20%). Round percentages to 0 decimal places, e.g. 12%.)