Table:
text: Evonne Goolagong career statistics
Women's Doubles: 6 finals (5 titles, 1 runner-up)
Women's Doubles: 6 finals (5 titles, 1 runner-up)
Outcome Year_ Championship Surface Partner Opponents Score
Winner 1971 Australian Open Grass Margaret Court Joy Emerson Lesley Hunt 6–0, 6–0
Runner-up 1971 Wimbledon Grass Margaret Court Rosemary Casals Billie Jean King 6–3, 6–2
Winner 1974 Australian Open (2) Grass Peggy Michel Kerry Harris Kerry Melville 7–5 6–3
Winner 1974 Wimbledon Grass Peggy Michel Helen Gourlay Karen Krantzcke 2–6, 6–4, 6–3
Winner 1975 Australian Open (3) Grass Peggy Michel Margaret Court Olga Morozova 7–6, 7–6
Winner 1976 Australian Open (4) Grass Helen Gourlay Renáta Tomanová Lesley Turner Bowrey 8–1

Question: What was the surface for Evonne Goolagong's career statistics during Wimbledon 1974?