Monthly median number of MBPs detected over a FOV covering approximately ±5° in latitude versus solar latitude, plotted separately for yearly periods from November 2006 to October 2013. Top panel: starting point is marked by a cross while the last data point is depicted as a star. Each yearly period is shown in a different color and line style (according to the legend). Bottom panel: same as in the top panel but each yearly period is approximated by a linear trend line encoded in the same color and line style as in the top panel.