"since_year","till_year","Number","Graph"
"100","199","1",""
"1500","1599","1",""
"1600","1699","147","="
"1700","1799","456","====="
"1800","1899","3868","======================================="
"1900","1999","14704","==================================================================================================================================================="
"2000","2099","3496","==================================="