> There has been one faithless elector in each of the following
> elections: 1948, 1956, 1960, 1968, 1972, 1976, and 1988. A
> blank ballot was cast in 2000. In 2016, seven electors broke with > their state on the presidential ballot and six did so on the vice presidential ballot.
https://history.house.gov/Institution/Electoral-College/Electoral-College/