"from_Year","till_Year","Total","Graph"
"800","899","1",""
"900","999","2",""
"1200","1299","1",""
"1500","1599","33",""
"1600","1699","489","====="
"1700","1799","3919","======================================="
"1800","1899","9813","=================================================================================================="
"1900","1999","3903","======================================="
"2000","2099","73","="