Period and Percentage of AP Exam:
Period 1 (1491-1607): 5%
Period 2 (1607-1754), Period 3 (1754-1800), Period 4 (1800-1848), Period 5 (1844-1877): 45%
Period 6 (1865-1898), Period 7 (1890-1945), Period 8 (1945-1980): 45%
Period 9 (1980-present): 5%
Period 1 (1491-1607): 5%
Period 2 (1607-1754), Period 3 (1754-1800), Period 4 (1800-1848), Period 5 (1844-1877): 45%
Period 6 (1865-1898), Period 7 (1890-1945), Period 8 (1945-1980): 45%
Period 9 (1980-present): 5%