successively held the highest rating from January 1952 until May 2003, by whole month periods are: The summary of teams that have held the highest rating from 1952 to the present by whole month periods are: ICC Test Championship (2002–2019) The rankings system was called ICC Test Championship, until the inauguration of ICC World Test Championship in 2019. From 2002 to 2019, the top-ranked Test team was awarded with the ICC Test Championship mace and the top team at each April 1 cut-off (until 2019) was also awarded a cash prize, the winners of which are listed below. The mace is now awarded to the winners of the ICC World Test Championship. Calculations Each team scores points based on the results of their matches over the last 3–4 years. A series must include at least two Tests. The rankings table gives the total points from all series played in the 12–24 months since the May before last, plus all the series played in the 24 months before that, for which the matches played and points earned both count half. Each May, the matches and points earned between 3 and 4 years ago are removed, and the matches and points earned between 1 and 2 years ago switch from 100% weighting to 50% weighting. For example, at May 2014, the matches played between May 2010 and May 2011 were removed, and the matches played between May 2012 and May 2013 switched to 50% weighting. This happens overnight, so can result in teams changing positions in the ranking table despite no one playing. Each time two teams complete another series, the rankings tables is updated as described below, based on the ratings of the teams immediately before they played. Step 1. Find the series points for each team Award 1 point to a team for each match won. Award point to a team for each match drawn or tied. Award 1 bonus point to the team winning the series. Award bonus point to each team if the series is drawn. Step 2. Convert these series points to actual ratings points If the gap between the ratings of the two teams before the series was less than 40 points The ratings points for each team equals: As each match won earns a team 1 series point and their opponent 0, losing earns them 0 series points and their opponent 1, and drawing earns