"since_year","till_year","Number","Graph"
"900","999","1",""
"1000","1099","1",""
"1100","1199","1",""
"1200","1299","2",""
"1300","1399","3",""
"1400","1499","11",""
"1500","1599","112","="
"1600","1699","115","="
"1700","1799","178","=="
"1800","1899","2442","========================"
"1900","1999","2746","==========================="
"2000","2099","184","=="
"2100","2199","5",""
"2200","2299","4",""
"2300","2399","1",""