1874 — 75 31.25 4.3 1875 — 76 29.55 6.3 1876 — 77 32.1 7.25 1877 — 78 31.1 6.9 1878 — 79 31.85 8.1 1879 — 80 33.6 7.4 1880 — 81 33.7 8.8 1881—