"since_year","till_year","Total","Graph"
"1300","1399","3",""
"1400","1499","15",""
"1500","1599","74","="
"1600","1699","109","="
"1700","1799","190","=="
"1800","1899","1562","================"
"1900","1999","1232","============"
"2000","2099","48",""