"since_year","till_year","Number","Graph"
"1660","1669","1",""
"1680","1689","2",""
"1690","1699","1",""
"1700","1709","4",""
"1710","1719","1",""
"1720","1729","3",""
"1730","1739","1",""
"1740","1749","4",""
"1750","1759","2",""
"1760","1769","5",""
"1770","1779","6",""
"1780","1789","6",""
"1790","1799","3",""
"1800","1809","3",""
"1810","1819","5",""
"1820","1829","3",""
"1830","1839","8",""
"1840","1849","9",""
"1850","1859","14","="
"1860","1869","13","="
"1870","1879","16","="
"1880","1889","10","="
"1890","1899","18","="
"1900","1909","13","="
"1910","1919","15","="
"1920","1929","16","="
"1930","1939","14","="
"1940","1949","20","="
"1950","1959","16","="
"1960","1969","19","="
"1970","1979","35","=="
"1980","1989","30","=="
"1990","1999","30","=="
"2000","2009","40","=="
"2010","2019","25","="
"2020","2029","17","="