$AMZN AWS generated $34.6 billion in revenue, accounting for 32.3% of the market. $MSFT Azure came in second with $18.1 billion in 2019 sales and 16.9% market share. $GOOGL Cloud, third with $6.2 billion in sales and 5.8% market share. $MSFT is growing the fastest, 63.5% YOY 2019