"since_year","till_year","Number","Graph"
"210","219","1",""
"1570","1579","1",""
"1590","1599","1",""
"1600","1609","1",""
"1610","1619","1",""
"1620","1629","10","="
"1630","1639","13","="
"1640","1649","6",""
"1650","1659","2",""
"1660","1669","9",""
"1670","1679","11","="
"1680","1689","23","="
"1690","1699","17","="
"1700","1709","15","="
"1710","1719","20","="
"1720","1729","31","=="
"1730","1739","30","=="
"1740","1749","35","=="
"1750","1759","29","="
"1760","1769","33","=="
"1770","1779","37","=="
"1780","1789","50","==="
"1790","1799","50","==="
"1800","1809","82","===="
"1810","1819","113","======"
"1820","1829","128","======"
"1830","1839","198","=========="
"1840","1849","286","=============="
"1850","1859","374","==================="
"1860","1869","494","========================="
"1870","1879","509","========================="
"1880","1889","629","==============================="
"1890","1899","741","====================================="
"1900","1909","895","============================================="
"1910","1919","1066","====================================================="
"1920","1929","1152","=========================================================="
"1930","1939","1378","====================================================================="
"1940","1949","1408","======================================================================"
"1950","1959","1401","======================================================================"
"1960","1969","1649","=================================================================================="
"1970","1979","1718","======================================================================================"
"1980","1989","1748","======================================================================================="
"1990","1999","1812","==========================================================================================="
"2000","2009","1883","=============================================================================================="
"2010","2019","1541","============================================================================="
"2020","2029","503","========================="