Table: train_arrivals
Columns: period
trains_arriving_within_5_mins_of_scheduled_time_over_three_months
change_over_same_quarter_the_previous_year
trains_arriving_within_5_mins_of_scheduled_time_moving_annual_average_maa
change_over_previous_year_as_a_whole

Question: What's the change over previous year as a whole in the period in which the change over same quarter the previous year was up 2.8%?
SQL: SELECT "change_over_previous_year_as_a_whole" FROM train_arrivals WHERE "change_over_same_quarter_the_previous_year" = 'Up 2.8%'

Question: When was the percentage of trains arriving within 5 minutes of scheduled time 89.6%?
SQL: SELECT "period" FROM train_arrivals WHERE "trains_arriving_within_5_mins_of_scheduled_time_moving_annual_average_maa" = '89.6%'

Question: What's the change over same quarter the previous year in the period when the 89.6% of the trains arrive within 5 minutes of scheduled time (over three months)?
SQL: SELECT "change_over_same_quarter_the_previous_year" FROM train_arrivals WHERE "trains_arriving_within_5_mins_of_scheduled_time_over_three_months" = '89.6%'