well either of the above will tell you that. If you want it to be displayed in a graph form such that you monitor the trend I would recommend you explore the use of a Dashboard. You can look at created vs. resolved or one of the bar graphs. you can set the intervals as well.
ok so you are asking - "how many tickets are closed w/in 14d of being created?"
So OOTB there is date compare capability. You could accomplish this with an addon like Scriptrunner which supports date compare...
issueFunction in dateCompare("", "resolutionDate < created+14d")
you could also use the same addon to set the due date of all issues based upon create date and they use filter subscriptions or automation to notify when overdue.
there are other addon solutions, e.g. Power Scripts and Automation for Jira as well and the best solution depends on your requirement details. If you have one of these addons you are good to go. If not it is worth noting that A4J has a free version that would be worth installing.
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