So here's the problem. I have a list of sales from last year. I need to find out how many of each part number was sold. The first column has part numbers, second has quantity. The part numbers may appear once, they may appear in 100 lines. There are 18000 lines or so total. How in the world do I do this?

Example:

Model # Qty
19A4GLTEFU 13
19A4GLTEFU 3
19A4GLTEFU 1
19A4GLTEFU 2
19A4GLTEFU 1
19GOBI2FU2 10
19GOBI2FU2 20
19GOBI2000FU 6
19GOBI2000FU 1
19GOBI2FU2 1
19GOBI2FU2 5
19GOBI2FU2 1
19GOBI2FU2 5
19GOBI2FU2 1
19GOBI2FU2 1
19GOBI2000FU 1
19GOBI2FU2 6
19GOBI2000FU 2
19GOBI2FU2 3
19GOBI2FU2 1
19GOBI2FU2 43
19GOBI2FU2 2
19GOBI2000FU 2
19GOBI2000FU 3
19GOBI2000FU 3
19GOBI2000FU 1