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].

[57, 81, -99]
[69.0, -9.0]

[-85, 71, 61, 74, -76, -61, 49, -68, -71, -45, -36, -3, 85, -60]
[-7.0, 66.0, 67.5, -1.0, -68.5, -6.0, -9.5, -69.5, -58.0, -40.5, -19.5, 41.0, 12.5]

[-54, 12, -29]

[-21.0, -8.5]