CREATE TABLE table_4199 ("Head of mission" TEXT, "Tenure begins" FLOAT, "Tenure ends" FLOAT, "French Head of State" TEXT, "Japanese emperor" TEXT)

How many French heads of state have a head of mission of Xavier Daufresne de la Chevalerie?
SELECT COUNT("French Head of State") FROM table_4199 WHERE "Head of mission" = 'Xavier Daufresne de la Chevalerie'
SELECT COUNT("French Head of State") FROM "table_4199" WHERE "Head of mission" = 'Xavier Daufresne de la Chevalerie'