Industry Minister James Moore has joined a long list of incumbent MPs who have either resigned or announced they will not run in the next federal election, which is expected in October.

That makes 33 Conservatives MPs who have either left or plan to leave, in addition to 14 New Democrats, five Liberals and seven others who won't be running again, for a total of 59 exiting incumbents, according to a tally on PunditsGuide.ca.

Some are asking: Is it normal to have 59 incumbent MPs not standing in the next election?



Others want to know: Is any party losing members at a faster rate than rival parties?



Here is an analysis of those two questions, based on the latest figures.

First, it appears that a greater proportion of Conservative MPs (21 per cent) are out so far than New Democrat MPs (15 per cent) or Liberal MPs (14 per cent).

Second, it seems that more incumbents are leaving than usual -- 19 per cent are out already, compared to 16 per cent on average over the past seven elections.

However, the proportions of MPs who retired have varied widely by election year since 1993.

For example, 72 of 295 incumbents -- 24 per cent -- were out before the 1993 general election, in which the incumbent Progressive Conservative Party under Kim Campbell was trounced by Jean Chretien’s Liberals.



That's compared to only 19 of 308 incumbents -- six per cent -- who left ahead of the 2011 election.

This time around looks closest to 2004, when the incumbent Liberals led by Paul Martin failed to win a majority for the first time since 1993. That year 58 of 308 -- 19 per cent -- were gone.

Here’s a breakdown of the numbers: