CREATE TABLE table_39451 ("Team" TEXT, "Average" FLOAT, "Points" FLOAT, "Played" FLOAT, "1988-89" TEXT, "1989-90" TEXT, "1990-1991" FLOAT)

How much Average has a Team of san lorenzo, and a 1990-1991 smaller than 45?
SELECT COUNT("Average") FROM table_39451 WHERE "Team" = 'san lorenzo' AND "1990-1991" < '45'
SELECT COUNT("Average") FROM "table_39451" WHERE "1990-1991" < '45' AND "Team" = 'san lorenzo'