Can someone explain to me how LP amount is determined?..

I thought it was based on wins in a row, or more wins than losses.. but I'm on a 10 game win streak right now and my LP gains are actually going down.... The account I'm playing on only has 19 Win and 13 losses, still more wins than losses.. im Silver 2 atm, and my previous game gave me +19, but this last one I won gave me +17... what gives?? Is it based on something else besides wins or something?
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