"since_year","till_year","Number","Graph"
"1640","1649","1",""
"1670","1679","1",""
"1680","1689","4",""
"1690","1699","1",""
"1700","1709","5",""
"1710","1719","4",""
"1720","1729","6",""
"1730","1739","9",""
"1740","1749","10","="
"1750","1759","5",""
"1760","1769","4",""
"1770","1779","9",""
"1780","1789","9",""
"1790","1799","3",""
"1800","1809","7",""
"1810","1819","6",""
"1820","1829","9",""
"1830","1839","11","="
"1840","1849","23","="
"1850","1859","16","="
"1860","1869","16","="
"1870","1879","6",""
"1880","1889","12","="
"1890","1899","11","="
"1900","1909","13","="
"1910","1919","14","="
"1920","1929","9",""
"1930","1939","10","="
"1940","1949","17","="
"1950","1959","13","="
"1960","1969","10","="
"1970","1979","12","="
"1980","1989","7",""
"1990","1999","14","="
"2000","2009","13","="
"2010","2019","5",""
"2020","2029","2",""