CREATE TABLE "table1_171748_3" (
  "period" text,
  "pct_trains_arriving_within_5_mins_of_scheduled_time_over_three_months" text,
  "change_over_same_quarter_the_previous_year" text,
  "pct_trains_arriving_within_5_mins_of_scheduled_time_moving_annual_average_maa" text,
  "change_over_previous_year_as_a_whole" text
);

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 "table1_171748_3" 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 "table1_171748_3" WHERE "pct_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 "table1_171748_3" WHERE "pct_trains_arriving_within_5_mins_of_scheduled_time_over_three_months"='89.6%';