Erling Haaland, the Norwegian forward who recently joined Manchester City from Borussia Dortmund, has been a sensation in the world of football since his debut. He has already scored 12 goals and provided three assists in just five matches for City.

To analyze Erling Haaland's goal efficiency at Borussia Dortmund, we need to look at his performance in the Bundesliga and Europe. In the Bundesliga, Haaland has scored 87 goals in 94 appearances over two seasons, averaging 9.5 goals per game. This is a remarkable record, especially considering that he only played 76% of the available minutes in the league last season.

Haaland's European exploits have also been impressive. In his first season with Dortmund, he scored 21 goals in all competitions, including 15 in the Champions League. In the second season, he scored 26 goals in 35 games across all competitions, including 15 in the Champions League.

In terms of overall efficiency, Haaland's goalscoring rate of 0.77 goals per match is one of the highest in the world. His ability to score regularly and efficiently is evident from his 132 goals in 124 appearances for Borussia Dortmund, which puts him among the top scorers in German football history.

However, it is important to note that Haaland's success in both domestic and international competitions is not without its challenges. The pressure of living up to expectations after signing a big-money move to one of the most prestigious clubs in the world can be daunting. Additionally, injuries and form fluctuations can affect his performance, making it difficult to predict his output consistently.

Despite these challenges, Haaland has shown time and again that he is capable of producing exceptional performances. His goalscoring prowess and work ethic make him a valuable asset to any team, and his future prospects look bright as he continues to improve and mature as a player.