CREATE TABLE table_47791 ("Year" FLOAT, "Date" TEXT, "Winner" TEXT, "Result" TEXT, "Loser" TEXT, "Location" TEXT)

How many years did the new york giants win with a result of 15-7 at lincoln financial field?
SELECT COUNT("Year") FROM table_47791 WHERE "Location" = 'lincoln financial field' AND "Winner" = 'new york giants' AND "Result" = '15-7'
SELECT COUNT("Year") FROM "table_47791" WHERE "Location" = 'lincoln financial field' AND "Result" = '15-7' AND "Winner" = 'new york giants'