Republican Party (United States): chart of total electoral votes collected by year in presidential elections (1856-2016)

Reference 1: Votes, Vote% and +/-.

Reference 2: 1856, 1860, 1864, 1868, 1872, 1876, 1880, 1884, 1888, 1892, 1896, 1900, 1904, 1908, 1912, 1916, 1920, 1924, 1928, 1932, 1936, 1940, 1944, 1948, 1952, 1956, 1960, 1964, 1968, 1972, 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012 and 2016.

Source: http://en.wikipedia.org/wiki/United_States_Republican_Party