"since_year","till_year","Total","Graph"
"700","799","1",""
"800","899","7",""
"900","999","19",""
"1000","1099","28",""
"1100","1199","10",""
"1200","1299","4",""
"1300","1399","8",""
"1400","1499","7",""
"1500","1599","21",""
"1600","1699","258","==="
"1700","1799","1747","================="
"1800","1899","3979","========================================"
"1900","1999","10754","============================================================================================================"
"2000","2099","50","="