How have the 'Fab Four' performed in their last 20 Test matches?

Among the 'Fab Four', Kane Williamson has scored most runs (2,267) and most hundreds (11) in his last 20 matches. Joe Root has scored 1,761 runs at an average of 58.70, while Steve Smith has scored 1,269 runs at 39.65. Virat Kohli has scored 1,301 runs at 38.26. Kohli has hit two hundreds in his last 20 Tests.