"since_year","till_year","Total","Graph"
"1200","1299","1",""
"1300","1399","1",""
"1400","1499","18",""
"1500","1599","22",""
"1600","1699","99","="
"1700","1799","348","==="
"1800","1899","569","======"
"1900","1999","875","========="
"2000","2099","69","="