CREATE TABLE table_30296 ("Vessel" CLOB, "Built" FLOAT, "Max Speed" CLOB, "Length" CLOB, "Breadth" CLOB, "Flag" CLOB, "Propulsion" CLOB)

How many breadth entries are there when propulsion is jet?
SELECT COUNT("Breadth") FROM table_30296 WHERE "Propulsion" = 'Jet'
SELECT COUNT("Breadth") FROM "table_30296" WHERE "Propulsion" = 'Jet'