CREATE TABLE table_70459 ("Episode No." FLOAT, "Airdate" TEXT, "Total Viewers" FLOAT, "Share" TEXT, "BBC One Weekly Ranking" FLOAT)

What is the total number of total viewers with a share of 18.8% and a weekly ranking under 16?
SELECT COUNT("Total Viewers") FROM table_70459 WHERE "Share" = '18.8%' AND "BBC One Weekly Ranking" < '16'
SELECT COUNT("Total Viewers") FROM "table_70459" WHERE "BBC One Weekly Ranking" < '16' AND "Share" = '18.8%'