CREATE TABLE table_204_593 (id DECIMAL, "year" TEXT, "chairperson" TEXT)

how many total chairpersons were there between 1905 and 1921 ?
SELECT COUNT("chairperson") FROM table_204_593 WHERE "year" >= 1905 AND "year" <= 1921
SELECT COUNT("chairperson") FROM "table_204_593" WHERE "year" <= 1921 AND "year" >= 1905