Joel Luckhaupt tweeted something about this earlier in the week or some time last week. . . well, at some point he mentioned Bronson's pitch counts for the year. So I found out info for pitch counts by year as a Cincinnati Red.

2006: 109.9
2007: 100.8
2008: 101
2009: 103.2
2010: 98.7
2011: 103.2
2012: 92.4
2013: 90.9

Arroyo is 36 this year. I'm not sure anyone is surprised by this decline, but it's worth noting that he's gone above 100 pitches only once this year.