The Hilux and D-Max are slugging it out at the top, well above the rest. GM has given up on the Colorado, with few right hand drive markets taking the model and selling in small numbers in Thailand - where it was made - meant the business case for a new model didn't stack up.
Mazda has a switched from a Ranger sourced model to an Isuzu one. Ford will now supply VW so it seems any chance GM had of securing an outsourced vehicle were squashed. Mind, you, they were losing money in Australia so GM has quit RH drive altogether now.
For more on pick-ups, try these if you wish.
2019: Australia/New Zealand/South Africa
2015-19: Belgium Denmark France Iceland Italy Sweden United Kingdom
Argentina Brazil Indonesia Thailand
2015: World Top 50