The percentages will definitely decrease as the number of takes increases, especially once it's more than just those of us who trawl the New and Reset Quizzes page
There was no "potato blight" in relation to question 2, there was never a shortage of food except by way of theft by an invading country. It was a genocide perpetrated by the English.
Ireland certainly was struck by potato blight which caused the potato harvest to fail for several years in the 1840s. Whatever other causes contributed to widespread starvation and emigration, it's just weird to claim there was no potato blight.
"The proximate cause of the famine was a potato blight"