SELECT "Conv" FROM table_51351 WHERE "Span" = '1992-2000'
on the span of 1992-2000, what was the conv ?
CREATE TABLE table_51351 (
    "Player" text,
    "Span" text,
    "Start" text,
    "Tries" text,
    "Conv" text,
    "Pens" text,
    "Drop" text
)