Balls Per Over in Tests by Country

In ENGLAND:
4     1880  to  1888
5     1890  to  1899
6     1902  to  1938
8     1939
6     1946  to  date

In AUSTRALIA:
4     1876-77  to  1887-88
6     1891-92  to  1920-21
8     1924-25
6     1928-29  to  1932-33
8     1936-37  to  1978-79
6     1979-80  to  date

In SOUTH AFRICA:
4     1888-89
5     1891-92  to  1898-99
6     1902-03  to  1935-36
8     1938-39  to  1957-58
6     1961-62  to  date

In WEST INDIES:
6     1929-30  to  date

In NEW ZEALAND:
6     1929-30  to  1967-68
8     1968-69  to  1978-79
6     1979-80  to  date

In INDIA:
6     1933-34  to  date

In PAKISTAN:
6     1954-55  to  1972-73
8     1974-75  to  1977-78
6     1978-79  to  date

In SRI LANKA:
6     1981-82  to  date

In ZIMBABWE:
6     1992-93  to  date

In BANGLADESH:
6     2000-01  to  date

 Contributed by aslam (asiddiqui@xray.indyrad.iupui.edu)