Histogram and table of relative numbers given on a yearly basis. Left panel: histogram for the BFs of individual years. Inside a distribution function f_ijk each bar represents the events per year, from 1990 to 2008. The data for 2005 are missing. The data for 1990 at the beginning of the mission are very sparse, which is also the case towards the end of the mission (after 2005). Right panel: relative number of events by the BFs of the five most representative distribution functions. For each intermediate row, gives the sum of the years above, and the last column (‘Sum’) gives the sums of each row. The sum of the last column is 61.57%. Thus, with these five distribution functions we cover approximately 62% of all events (70.7% events without CME).