Number of recorded US storms (Annual Average over Decade)

 
1850s - 17
1860s - 15
1870s - 19
1880s - 25
1890s - 20
1900s - 17
1910s - 21
1920s - 15
1930s - 18
1940s - 23
1950s - 20
1960s - 15
1970s - 12
1980s - 17
1990s - 15
2000s   19
2010s -  9