I’ve recently been investigating whethether high rates of abstentions and missing data cause problems for roll-call analysis of the Italian parliament. Here are some figures for the 14th Camera. Of the 1,141,673 possible votes (1657 rollcalls with 689 individuals):

• 23.5% were votes in favour
• 51.6% were votes against
• 1.8% were registered abstentions
• 23.1% were absent — that is, that particular legislator was not included in the roll-call

which, according to this paper by Rosas and Shomer, is high compared to the US Congress and French Assemblee Nationale (4th Republic), but low compared to Brazil or Argentina.