"since_year","till_year","Number","Graph"
"50","59","1",""
"1740","1749","1",""
"1780","1789","3",""
"1790","1799","1",""
"1800","1809","4",""
"1810","1819","6",""
"1820","1829","4",""
"1830","1839","9",""
"1840","1849","17","="
"1850","1859","31","=="
"1860","1869","35","=="
"1870","1879","38","=="
"1880","1889","41","=="
"1890","1899","63","==="
"1900","1909","60","==="
"1910","1919","63","==="
"1920","1929","63","==="
"1930","1939","65","==="
"1940","1949","72","===="
"1950","1959","78","===="
"1960","1969","73","===="
"1970","1979","59","==="
"1980","1989","82","===="
"1990","1999","61","==="
"2000","2009","70","===="
"2010","2019","14","="
"2020","2029","1",""