How to find transaction number

[Peter Sik]

I would like to find the following information, wondering where I can find:

1. Number of property listing in city

2. Number of transaction completed 

I have heard the property market is slowed down a lot, like there is 1000 listing in El Monte with like 50 transaction last month. The ratio is 20:1, is this consider slow market? I don't know, I need previous data to do comparison. Thank you n advance