In the last decade we played 61 Test matches, playing 120 innings. Amongst them we crossed 270 22 times. That's 18.3%.
Since the turn of the decade, we've scored over 270 18 times out of 28, including 9 in a row spanning 5 Test matches. That represents a significant boost to 64.3%.
When you regularly score over 540 runs in a match the less chance of suffering an innings defeat, which is exactly what's happened. Amongst our 52 Test defeats in the previous decade, we lost by an innings 30 times (57.7%). This decade amongst our 13 defeats, only 2 have been by an innings (15.4%). It's not much to shout about but we have to look at the small improvements before looking at the bigger improvements.