Question: What's the 1851 when 1881 had 764?
SQL: SELECT "1851" FROM "2-1890195-1" WHERE "1881" = '764';

Question: What's the year when 1851 had 634?
SQL: SELECT "Year" FROM "2-1890195-1" WHERE "1851" = '634';

Question: What's the 1881 when 1871 had 1017?
SQL: SELECT "1881" FROM "2-1890195-1" WHERE "1871" = '1017';

Question: What's the 1861 had 1991 in 1881 and a Year of Year?
SQL: SELECT "1861" FROM "2-1890195-1" WHERE "Year" = 'Year' AND "1881" = '1991';

Question: What's the 1881 with 1961 in 1851?
SQL: SELECT "1881" FROM "2-1890195-1" WHERE "1851" = '1961';