and sheet music sales. Mejía Barquera then took one chart from the second week of every month of a calendar year, so as to have twelve charts per year, and asigned "points" to the songs on those charts based on their ranking (from 10 points for a first place to 1 point for a tenth place), adding up the points to make his year-end charts. 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 Notes References Mexico Mexican record charts 1950s in music 1950s in Mexico