What is the largest number of Peak lessons taught when the Evaluation average (Before April 2009) was 4.4?
CREATE TABLE "belt_requirements" (
  "evaluation_average_from_february_2011" real,
  "evaluation_average_from_april_2009" text,
  "evaluation_average_before_april_2009" text,
  "pct_of_negative_evaluations" text,
  "submitting_schedule_on_time" text,
  "punctuality_attendance_issues" text,
  "peak_lessons_taught" real
);
SELECT MAX("peak_lessons_taught") FROM "belt_requirements" WHERE "evaluation_average_before_april_2009"='4.4';