12 x 12.4 inch (30 x 31 cms)16 x 16.5 inch (41 x 42 cms)20 x 20.7 inch (51 x 53 cms)24 x 24.8 inch (61 x 63 cms)28 x 28.9 inch (71 x 73 cms)32 x 33.1 inch (81 x 84 cms)36 x 37.2 inch (91 x 94 cms)42 x 43.4 inch (107 x 110 cms)48 x 49.6 inch (122 x 126 cms)54 x 55.8 inch (137 x 142 cms)