Graph below visualizes the weekly volume for the top 5 pools.

Some noteble observations;

1. USDC-WETH 3000 60 dominations decreases over the weeks and being take over gradually by USDC-WETH 500 10 pool.
2. DAI-WETH 500 10 also increasing over time.

The total weekly swap volume for the past 10 weeks can be seen in graph below;

Some observation that can be made are;

1. Amount out of the pool corresponds with amount into the pool.
2. Early June records the most total swap volume with around 8.25B USD into the pool and a little bit less being swapped out (8.13B USD)

For the most recent week (26th July 2021), the top 5 pools on Uniswap are as tables below;

1. USDC-WETH 500 10
2. USDC-WETH 3000 60
3. WETH-USDT 500 10
4. WETH-USDT 3000 60
5. DAI-WETH 500 10

My observation is that the top 5 pools are usually these same pools. Many users love to use the stablecoins pools as they are more secure on interest returns.