$1234567891011-1-2$Number ofPeople$16-2021-2526-3031-35$Age$[$Graphs generated by this script: initPicture$(-3,7,-2,11)$;axes$(10,1,1)$;text$([-1,5],$'Number of$\text{'},$'left'$)$;text$([-1,4],$'People','left'$)$;fill$=$'blue';rect$([1,0],[2,5])$;rect$([2\mathrm{.}5,0],[3\mathrm{.}5,10])$;rect$([4,0],[5,8])$;rect$([5\mathrm{.}5,0],[6\mathrm{.}5,6])$;text$([1\mathrm{.}5,0],\text{'}16-20\text{'},$'below'$)$;text$([3,0],\text{'}21-25\text{'},$'below'$)$;text$([4\mathrm{.}5,0],\text{'}26-30\text{'},$'below'$)$;text$([6,0],\text{'}31-35\text{'},$'below'$)$;text$([4,-1],$'Age','below'$)$;fill$=$'white';stroke$=$'white';rect$([-\mathrm{.}5,-2],[\mathrm{.}5,-\mathrm{.}1])$;$]$

A frisbee$-$golf club recorded the ages of its members and used the results to construct this graph.

Find the number of members $30$ years of age or younger