I have a West Bend 30 cup percolator. It is approx 29 yrs old Model 58200. I lost the directions. Please provide approx #of cups of ground coffee or measurements for brewing 12, 18, 24 & 30 cups. The original instructions had a table /w a range, i.e. 2-2.5 cups ground coffee per 30 cups yield if I recall correctly. Please provide instructions if available.