Because of Twitter API restrictions, the earliest private tweet metrics Rival IQ can access is from 90 days before the day you connected to Twitter Analytics. Even though Rival IQ may have been tracking your Twitter account for 2 years, private metrics such as impressions and clicks are not available for the entire 2 years. 

As long as your Twitter account is connected to Twitter Analytics, Rival IQ will continuously keep your metrics fresh. 

If you are looking for help connecting Twitter accounts, read this article to learn how to get connected.