Simplify the following text for a Grade 7 native English-speaking person.
Original: According to the 2002 census , 36,983,700 people , or 96.74 % of the population , consider themselves Polish , while 471,500 ( 1.23 % ) declared another nationality , and 774,900 ( 2.03 % ) did not declare any nationality .
Simplified: Today 36,983,700 people , or 96.74 % of the population call themselves Polish ( Census 2002 ) , while 471,500 people ( 1.23 % ) claimed another nationality . 774,900 people ( 2.03 % ) did not declare any nationality .