These data are from the article "The Maunder Minimum" by John A. Eddy, Science, Vol 192, pp 1189-1202. Table 1 data appear here: Table 1. Estimated annual mean sunspot number, R, from 1610 to 1715. X = sunspots noted but not counted; XX = unusual number of sunspots noted but not counted; (X) = unusually small number of sunspots noted but not counted. Schove's values are for the maxima of each supposed cycle. YEAR R Note Waldmeier Schove ========================================================= 1610 X 1611 30 Minimum 1612 53 1613 28 1614 1615 X 1616 X Maximum 90 1617 X 1618 (X) 1619 Minimum 1620 1621 X 1622 X 1623 X 1624 X 1625 41 1626 40 Maximum 100 1627 22 1628 1629 (X) 1630 1631 1632 (X) 1633 1634 (X) Minimum 1635 (X) 1636 1637 1638 X 1639 XX 1640 Maximum 70 1641 1642 6 1643 16 1644 15 1645 0 Minimum 1646 1647 1648 1649 Maximum 40 1650 0 1651 0 1652 3 1653 0 1654 2 1655 1 Minimum 1656 2 1657 0 1658 0 1659 0 1660 4 Maximum 50 1661 4 1662 0 1663 0 1664 0 1665 0 1666 0 Minimum 1667 0 1668 0 1669 0 1670 0 1671 6 1672 4 1673 0 1674 2 1675 0 Maximum 60 1676 10 1677 2 1678 6 1679 0 1680 4 Minimum 1681 2 1682 0 1683 0 1684 11 1685 0 Maximum 50 1686 4 1687 0 1688 5 1689 4 1690 0 Minimum 1691 0 1692 0 1693 0 Maximum 30 1694 0 1695 6 1696 0 1697 0 1698 0 Minimum 1699 0 1700 2 5 1701 4 11 1702 6 16 1703 8 23 1704 9 36 1705 18 58 50 1706 15 29 1707 18 20 1708 8 10 1709 3 8 1710 2 3 1711 0 0 1712 0 0 1713 2 2 1714 3 11 1715 10 27