"since_year","till_year","Number","Graph"
"190","199","1",""
"1550","1559","1",""
"1600","1609","1",""
"1610","1619","4",""
"1620","1629","4",""
"1630","1639","6",""
"1640","1649","13","="
"1650","1659","17","="
"1660","1669","22","="
"1670","1679","21","="
"1680","1689","30","=="
"1690","1699","29","="
"1700","1709","23","="
"1710","1719","38","=="
"1720","1729","42","=="
"1730","1739","37","=="
"1740","1749","34","=="
"1750","1759","40","=="
"1760","1769","36","=="
"1770","1779","64","==="
"1780","1789","68","==="
"1790","1799","74","===="
"1800","1809","95","====="
"1810","1819","141","======="
"1820","1829","143","======="
"1830","1839","202","=========="
"1840","1849","321","================"
"1850","1859","458","======================="
"1860","1869","611","==============================="
"1870","1879","533","==========================="
"1880","1889","661","================================="
"1890","1899","698","==================================="
"1900","1909","945","==============================================="
"1910","1919","1029","==================================================="
"1920","1929","1083","======================================================"
"1930","1939","1267","==============================================================="
"1940","1949","1324","=================================================================="
"1950","1959","1362","===================================================================="
"1960","1969","1891","==============================================================================================="
"1970","1979","1956","=================================================================================================="
"1980","1989","1783","========================================================================================="
"1990","1999","1928","================================================================================================"
"2000","2009","1795","=========================================================================================="
"2010","2019","1236","=============================================================="
"2020","2029","392","===================="