Using an "If" conditional within a "For In" statement

My understanding of the "For-In" statement - where the "For" refers to an NSDictionary object and the "In" refers to an NSArray of dictionary objects - is that the statement will iterate through each dictionary object in the array and perform whatever command is subsequently included in the For-In statement, and do this for each instance of the dictionary object in the Array.

So I'm a little perplexed why an "If" conditional that I include in the "For-In" executes only once, and then stops all subsequent iterations. Here is my code:

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ( [segue.identifier isEqualToString:@"showMuniType"] ) {

        NSMutableArray *passToTown = [[NSMutableArray alloc] init];
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        NSString *oyYearRow = [self.oyYear objectAtIndex:indexPath.row];
        for (NSDictionary *yearSegue in self.yearData) {
            HeaderData *year2 = [[HeaderData alloc] init];
            HeaderData *town2 = [[HeaderData alloc] init];
            year2.year = [yearSegue valueForKey:@"year"];
            town2.Town = [yearSegue valueForKey:@"town"];
            if ( oyYearRow == year2.year ) {
                [passToTown addObject:town2.Town];
            }

        }
        NSLog(@"%@", passToTown);
    }

}

What I'm trying to do is this:

There are 1,700 dictionary objects in my array, each with a key for "Year" and "Town". I'm trying to create a segue, where an array of towns is passed to another tableview based on the year selected. I figured the best way to do this would be a "For-If" statement to iterate through the array, and then an "If" statement to select only those towns coupled with the selected year.

But when I test the array that will be passed through the segue with the NSLog, I get only one Town object in my array. I'm certain it's the "If" statement that's causing the "For-If" to stop iterating because when I comment out the "If" statement I get all 1,700 Town objects in my the array.

Thoughts?