Test series can last from two to six matches, but some tours consist of only a single Test. Six-match series were common in the 1970s and early 1980s, with the last six-match series to date taking place in 1997–98 between the West Indies and England. Ashes Test series in England were six-match affairs between 1981 and 1997, but Australia reverted to five matches in its home series from 1982–83. The most important series last four or five matches, while the less important ones last two to three matches. Sometimes, a perpetual trophy is awarded to the winning team. Perpetual trophies include: