1.   They pitch on a rolling basis.

2.   Sanctioned by the Royal and Ancient Golf Club of St. Andrews, the World Rankings are computed on a three-year rolling basis weighted toward the current year.

3.   The ranking is computed on a two-year rolling basis weighted toward the current year.

4.   The ranking is computed on a three-year rolling basis weighted toward the current year.

5.   The ranking is computed on a two-year rolling basis.

6.   The rankings are computed on a two-year rolling basis weighted toward the current year.

7.   The government said that it hoped to move to a situation in which the six members of the committee would be appointed on a rolling basis.