Over the last 2010 years, 55% of total economic output happened in the 20th century, and an additional 23% of the total in just the first 10 years of the 21st century.
About 28% of the total years of human life lived in the last 2010 years happened during the 20th century, and about 6% of total years of human life lived in the last 2010 years happened in the first 10 years of the 21st century.
