https://en.wikipedia.org/wiki/Demographics_of_Iran#Religious...
Pre-1979, per the 1976 census, Iran had a Jewish population of 62,258 (0.2%). Post-revolution it immediately fell to ~9k, where it has remained - at least until the last census in 2016 (0.0% representation).
While Christian representation didn't decline by the same amount, it took a sharp decline as well. Pre revolution (1976) saw a Christian representation of around 0.5%. 30 years later (2006 census) it was 0.2%.
What conclusions you should draw from that are open to interpretation... and when it comes to life in the Middle East and North Africa, you can also draw relative comparisons (is Iran worse or better for these groups?). But it's usually not a good sign when the population of an ethic or religious minority takes a sharp and sudden decline.