CREATE TABLE table_2784 ("Release" TEXT, "Oricon Albums Chart" TEXT, "Peak Position" FLOAT, "Debut Sales  ( copies ) " FLOAT, "Sales Total  ( copies ) " FLOAT, "Chart Run" TEXT)

How many peak positions were there on the weekly charts?
SELECT COUNT("Peak Position") FROM table_2784 WHERE "Oricon Albums Chart" = 'Weekly Charts'
SELECT COUNT("Peak Position") FROM "table_2784" WHERE "Oricon Albums Chart" = 'Weekly Charts'