| Year of minimal average daily sunspot area1) | Outbreak of AIV2) (Strain, Year, Country) | Reference (Year) |
| 1878 | 1878, Italy | [ 31 ] (1878) |
| 1890 | HPAI, 1894 | [ 32 ] (1926) |
| 1902 | HPAI, 1901 | [ 33 ] (1975) |
| 1914 | HPAI H1N1, 1918, Spain | [ 34 ] (2008) |
| 1924 | LPAI H6N2, 1924-1925, USA | [ 35 ] (2017) |
| 1934 |
|
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| 1945 |
|
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| 1955 | HPAI H2N2, 1957, Hong Kong/H5N3, 1961, South Africa/H5N1, 1959, Scotland | [ 36 ] (1955) |
| 1966 | HPAI H5N9, 1966, Ontario/H3N2, 1968, Hong Kong | [ 37 ] (2000) |
| 1976 | HPAI H7N7, 1976, Australia/ H1N1, 1979, Europe/Germany and England | [ 37 ] (2000) |
| 1984 | HPAI H5N2, 1983-1984, Pennsylvania/ H5N8, 1983, Ireland/H7N3, 1985, Australia | [ 38 ] (2011) |
| 1995 | HPAI H5N1, China, 1994, 1996, 1997/H5N2, 1994, Mexico |
|
| 2006 | HPAI H7N3, 2004, Canada/H5N2, 2004, Texas and South Africa/H7N7, 2005, Korea/H5N1, 2005, China/H5N3, 2007, Canada/H5N8, 2010, East Asia, Europe, North America/HPAI H5N1, 2005, 2006, Eurasia | [ 38 ] (2011) |
| 2016 | LPAI H11N2, Antarctica, 2013/H5N5, Antarctica, 2015 HPAI H5N8, China, Korea, Japan, Germany, Netherland, UK, Italy, Russia, 2014/HPAI H5N6, China, Laos, Vietnam, Myanmar/HPAI H5N2, British Colombia, Canada, Washington, and 20 states, USA |
|