He's scored 168 goals in career 694 games over ten years, or 19.85 goals per 82 games. Half those seasons he scored at higher than a 20 goal pace, and half lower.
The last six seasons he's scored 93 goals in 384 games, or 19.86 goals per 82 games. Half those seasons he scored at higher than a 20 goal pace, and half lower.
The last four seasons he's scored 63 goals in 258 games, or 20.02 goals per 82 games. Half those seasons he scored at higher than a 20 goal pace, and half lower.
The last two seasons he's actually bettered his career pace with 40 goals in 139 games (23.4 goals per 82 games pace).
He's streaky (as is pretty much any true 3rd line quality player), and he's had some some injuries that he's had to work through, but he's a guy that's pretty reliably scored at a 20 goal pace over the long haul for the entirety of his career.
Who knows what his value is around the league, but I think calling him a defensively responsible 3rd line center who is a reasonable bet to score at a 20 goal pace any given year is a pretty accurate description.