"from_Year","till_Year","Total","Graph"
"800","899","1",""
"900","999","2",""
"1200","1299","1",""
"1500","1599","35",""
"1600","1699","471","====="
"1700","1799","3653","====================================="
"1800","1899","8575","======================================================================================"
"1900","1999","3202","================================"
"2000","2099","73","="