You only showed the magnitude for 6+ quakes, check "all quakes" in Quake Strength column and check "Number of quakes" in the Data to graph and you will see the all around number for quakes is down from previous years.
dlindquist.com - Research - Earthquake Project - Historical Quakes
And i wouldnt be shocked even if there are alot more stronger quakes these days, every year the equipment we use to measure this kind of activity only gets better...
