"since_year","till_year","Number","Graph"
"1670","1679","1",""
"1690","1699","3",""
"1700","1709","2",""
"1710","1719","4",""
"1720","1729","3",""
"1730","1739","3",""
"1740","1749","5",""
"1750","1759","4",""
"1760","1769","5",""
"1770","1779","10","="
"1780","1789","25","="
"1790","1799","20","="
"1800","1809","22","="
"1810","1819","50","==="
"1820","1829","66","==="
"1830","1839","91","====="
"1840","1849","151","========"
"1850","1859","210","==========="
"1860","1869","264","============="
"1870","1879","290","==============="
"1880","1889","325","================"
"1890","1899","398","===================="
"1900","1909","474","========================"
"1910","1919","547","==========================="
"1920","1929","629","==============================="
"1930","1939","644","================================"
"1940","1949","685","=================================="
"1950","1959","749","====================================="
"1960","1969","950","================================================"
"1970","1979","1037","===================================================="
"1980","1989","909","============================================="
"1990","1999","857","==========================================="
"2000","2009","657","================================="
"2010","2019","320","================"
"2020","2029","2",""
"2830","2839","1",""