I think it is agree, because it underlined the verb playing and the subject which is the people playing
A biography written with personal knowledge
the reader would try to get information from the graph.
for example:
there has been alot of rain going in california. but how could we know if it has lessened or have grown more ?
<h2>a graph is just a tool to see progress. :)</h2>
i hope it helped
A i looked it up on google