Daniel Ricciardo says he is 'happy' to put a troubled 2015 Formula 1 World Championship season behind him as he ended the year with a sixth place finish in the Abu Dhabi Grand Prix.

The Australian prevailed in frantic first lap to run fifth for the majority of the race, though he would later cede the position to the charging Sebastian Vettel to cross the line sixth.

Satisfied with the performance of his Red Bull this weekend, which had the measure of Williams but was out-paced by Force India, Ricciardo feels he got the best he could out of the car around the Yas Marina Circuit.

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"Top 5 would have been a bit sweeter, but I couldn't hold off Seb, whom we expected to get past us more towards the end of the race. I held him off for a lap and then, especially on those Options, his pace was so much quicker.

"I tried to get Perez, but couldn't get close enough. At the start I had a sniff at Hulkenberg and went for it and that paid off. Parts of it were fun. I would have liked more battles though, but it looked quite spread out. It's a circuit I enjoy fighting on.

"I have confidence in the big breaking zones here. I think we ended the season well and feel I got the most out of the car, so I'm leaving the season happier than I was a few races ago. Sixth is probably not that representative of how good our weekend was, but I'm pretty pleased.

Despite enjoying a more positive second-half of the season, Ricciardo admits he is happy to be see the back of the 2015 season, his eventual two podiums in stark contrast to the three wins he achieved with the team in 2014.

Finishing the season behind team-mate Daniil Kvyat in the overall standings, Ricciardo feels the tough year will simply make Red Bull stronger in 2016.

"I would love to go racing next weekend but at the same time I'm happy the season is over and I'm optimistic that next year will be better. I think we ended the season with a lot more feeling and confidence in the chassis. This season has made us stronger as a unit and I'm happy to move forward with these guys to be better next year."