You have no Statistics backgound at all?
U.S. National elections tend to be +/- 3% with a sample well under 5,000. This compares to a voting population of over 300,000,000. A little arithmetic shows 5,000/300,000,000 = 0.00001666... or about 0.002%. I would say your 1% is a VERY LARGE sample, but it really depends on what you are doing and how much your audience might care.