CREATE TABLE table_30153 ("State Rank" FLOAT, "National Rank" FLOAT, "Institution" TEXT, "Location" TEXT, "Public or Private" TEXT, "Endowment Funds" TEXT, "Percentage Change YOY" TEXT)

Name the total number of rank for percentage change yoy 13.1%
SELECT COUNT("National Rank") FROM table_30153 WHERE "Percentage Change YOY" = '13.1%'
SELECT COUNT("National Rank") FROM "table_30153" WHERE "Percentage Change YOY" = '13.1%'