"since_year","till_year","Total","Graph"
"200","299","1",""
"800","899","3",""
"900","999","2",""
"1000","1099","3",""
"1100","1199","5",""
"1200","1299","6",""
"1300","1399","10",""
"1400","1499","38",""
"1500","1599","209","=="
"1600","1699","763","========"
"1700","1799","2364","========================"
"1800","1899","5397","======================================================"
"1900","1999","5524","======================================================="
"2000","2099","254","==="