This Data Point summarizes trends in adult literacy and numeracy skills since the 1990s for the United States and for those countries that participated with the United States in all three international adult literacy studies over the past three decades: Canada, Hungary, Italy, Norway, the Netherlands, and New Zealand. Results in this Data Point are presented as average scores on the Program for the International Assessment of Adult Competencies (PIAAC) scale of 0-500 for both literacy and numeracy. This data point looks at: (1) International literacy studies since the 1990s; (2) How have levels of literacy changed over time?; and (3) How have levels of numeracy changed over time?