Table 5:
Cycle maxima determined by the 13-month mean with the International Sunspot Numbers and the Group Sunspot Numbers. The Group values are systematically lower than the International values prior to cycle 12.
| Cycle | International Maximum | Group SSN Maximum | ||
|---|---|---|---|---|
| Date | Value | Date | Value | |
| −4 | 1705/05 | 5.5 | ||
| −3 | 1719/11 | 34.2 | ||
| −2 | 1730/02 | 82.6 | ||
| −1 | 1739/05 | 58.3 | ||
| 0 | 1750/03 | 70.6 | ||
| 1 | 1761/06 | 86.5 | 1761/05 | 71.3 |
| 2 | 1769/09 | 115.8 | 1769/09 | 106.5 |
| 3 | 1778/05 | 158.5 | 1779/06 | 79.5 |
| 4 | 1788/02 | 141.2 | 1787/10 | 90.5 |
| 5 | 1805/02 | 49.2 | 1805/06 | 24.8 |
| 6 | 1816/05 | 48.7 | 1816/09 | 31.5 |
| 7 | 1829/11 | 71.5 | 1829/12 | 64.4 |
| 8 | 1837/03 | 146.9 | 1837/03 | 116.8 |
| 9 | 1848/02 | 131.9 | 1848/11 | 93.2 |
| 10 | 1860/02 | 98.0 | 1860/10 | 85.8 |
| 11 | 1870/08 | 140.3 | 1870/11 | 99.9 |
| 12 | 1883/12 | 74.6 | 1884/03 | 68.2 |
| 13 | 1894/01 | 87.9 | 1894/01 | 96.0 |
| 14 | 1906/02 | 64.2 | 1906/02 | 64.6 |
| 15 | 1917/08 | 105.4 | 1917/08 | 111.3 |
| 16 | 1928/04 | 78.1 | 1928/07 | 81.6 |
| 17 | 1937/04 | 119.2 | 1937/04 | 125.1 |
| 18 | 1947/05 | 151.8 | 1947/07 | 145.2 |
| 19 | 1958/03 | 201.3 | 1958/03 | 186.1 |
| 20 | 1968/11 | 110.6 | 1970/06 | 109.3 |
| 21 | 1979/12 | 164.5 | 1979/07 | 154.2 |
| 22 | 1989/07 | 158.5 | 1991/02 | 153.5 |
| 23 | 2000/04 | 120.7 | 2001/12 | 123.6 |
| 24 | 2014/04 | 81.9 | 2014/04 | 82.0 |