Time series of tropical cyclones (tropical storms and hurricanes) in the Central North Pacific basin from 1966 to 2010. Although there was a period of greater tropical cyclone activity from the 1980s to mid-1990s, the basin has again entered a quieter time, with fewer average annual occurrences of storms. Broken lines denote the means for the periods 1966-81, 1982-94, and 1995-2010. Data from Chu (2002), figure from Keener et al. (2012).