what percentage of income does one have to give to be in the top 1% in this category of people between those who regularly support charities?

I’m curious about the question “how much should one give?” and the question that immediately comes to mind is “what percentage of income does one have to give to be in the top 1% in this category of people between those who regularly support charities?”? This is not an important question, but maybe someone by chance knows the answer to it?