"since_year","till_year","Number","Graph"
"100","199","1",""
"400","499","2",""
"500","599","6",""
"600","699","9",""
"700","799","17",""
"800","899","64","="
"900","999","93","="
"1000","1099","135","="
"1100","1199","88","="
"1200","1299","116","="
"1300","1399","149","="
"1400","1499","129","="
"1500","1599","114","="
"1600","1699","494","====="
"1700","1799","3715","====================================="
"1800","1899","8219","=================================================================================="
"1900","1999","24752","========================================================================================================================================================================================================================================================"
"2000","2099","3875","======================================="