A supplier of high-quality audio equipment for automobiles accumulates monthly sales data on speakers and receiver-amplifier units for 5 years. The data (in thousands of units per month) are shown in the following table. Plot the sales data. Do you see any overall trend in the data? Do there seem to be any cyclic or seasonal effects?

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Year F M A M JAS N D 1 1019 93.0 93.5 939 104.9 946 105.9 1167 1284 118.2 107.3 1086 2 109.0 98.4 99.1 110.7 100.2 112.1 123.8 1358 1248 114. 114.9 1129 3 115.5 104.5 105.1 105.4 1175 1064 118.6 130.9 143.7 1322 120.8 1213 4 122.0 110.4 110.8 111.2 124.4 112.4 124.9 138.0 1515 139.5 127.7 128.0 5 128.1 115.8 116.0 117.2 130.7 1175 1318 145.5 159.3 146.5 134.0 134.2