In this task you are given a list of numbers and you need to find the average of each two consecutive values. The average of two numbers a and b is calculated as: (a + b) /2. The output should be a list of the averages of each two consecutive values. A list is presented with two brackets and comma-separated values, like: [1,2,3].

[-31, 47, -12, 69, 3, 15, 55, 87, 81, 75, -77, -59, -28]
[8.0, 17.5, 28.5, 36.0, 9.0, 35.0, 71.0, 84.0, 78.0, -1.0, -68.0, -43.5]

[-32, 68, 89, 47, -57, -43, -91, -62, 5, -88, 77, -84, 93, -67]
[18.0, 78.5, 68.0, -5.0, -50.0, -67.0, -76.5, -28.5, -41.5, -5.5, -3.5, 4.5, 13.0]

[-68, 33, -79, -4, -87, 47]

[-17.5, -23.0, -41.5, -45.5, -20.0]