13.1 x 12 inch (33 x 30 cms)17.5 x 16 inch (44 x 41 cms)21.8 x 20 inch (55 x 51 cms)26.2 x 24 inch (67 x 61 cms)30.5 x 28 inch (77 x 71 cms)34.9 x 32 inch (89 x 81 cms)39.3 x 36 inch (100 x 91 cms)45.8 x 42 inch (116 x 107 cms)52.4 x 48 inch (133 x 122 cms)