This statement from your article is completely misleading. Completely. There is no data (that I have found) showing any decline in mass shootings. The 3-4 mass shootings per year in the US is probably accurate since the 80's but that is not what we are talking about. During the 80's the US was experiencing less than 2 per year. Since 2010 we are averaging over 4 per year. Down playing it by stating the 3-4 per year does not mean it was less unless during the 80's and 90's there were actually fewer than that.His research has found while there were few such mass public shootings in the U.S. before the 1960s, the numbers have declined since the 1990s. America averages three or four cases a year since the 1980s.