There were a good number in 2014 as well, and does running for Pres absolve one of their duties in the Senate? Florida hired him to do a job, he is not doing it but I bet he is still taking his monthly paycheck.
He announced in Dec of 2014 - that’s where the chart takes an uptick. How do you expect someone to run without missing votes? What he said he’s done is to go back for important votes & ones where his votes might make a difference.
Cruz actually has a worse record