How do I measure the total number of customer tickets per day

I am losing my mind and I am sure this is very simple! 

I want to create a graph to show me the total number of tickets that required agent attention every day. I want to show new tickets, open tickets that had a reply from customers and re-opened tickets. I want the graph to show the trend by day. 

I can see the total new tickets created by day, but I cant work out how to add the total number of open or re-opened tickets that required a response from our team.