There was no left-arm wrist-spin in the early days of Test cricket. He was the only prominent bowler to bowl left-arm wrist-spin before the Wars. Right-handers outnumber left-handers significantly, and they find it easier to bat against the ball coming into them, which is what left-arm wrist-spinners bowl. The percentages reflect the ratio between balls bowled by left-arm wrist-spin to balls bowled by all spinners. To what extent they dominate left-arm wrist-spin will define the future of bowling’s rarest genre.