Whoa, hold on there. Selanne isn't exactly the model of consistency, and it's quite possible that his mid career swoon is what enaed him tonreturn from the lockout rejuvenated.
Selanne's mid-career swoon can be attributed to his trade to San Jose in February 2001. His offensive production fell off dramatically during his first full season with the Sharks in 2002, a direct result of both knee problems and playing under Darryl Sutter, whose system signaled death for any explosive individual talent. Sutter's offensive philosophy was based on equal distribution of the puck between all three forwards on the ice, and it stressed scoring depth over high individual scoring. When Selanne was in Anaheim, the Ducks had AHL-level offensive talent beyond him and Kariya, and their offensive understandably ran through their two explosive wingers. But San Jose was an extremely deep offensive team that spread the puck around. In 2001-2002, they scored 248 goals, only 3 less than the Hall of Fame showcase Detroit Red Wings. The Sharks did not have a 30 goal scorer, but they had six 20 goal scorers and eight players with over 17 goals. You can attribute Selanne's drop in goal production partially to this factor.
Selanne had several injury issues in San Jose, but it wasn't until 2004 in Colorado that his knee gave out on him completely. He was a disaster that year. You cringed when you watched him because he had none of that speed nor explosiveness. The lockout was the greatest thing to ever happen to him. He had multiple knee surgeries following 2004 and had all the time in the world to recover and rehabilitate back to full-strength. So I would say, beyond the 2 full years he spent in SJ, in a tough system, and that 1 year in Colorado, with both of his knees shot, that Selanne has been pretty damn consistent.