There are (at the time of writing this; see edits at bottom of post) 54.2k questions with close votes on the review page on Stack Overflow. Unlike the other review tasks, which all usually return to 0 quickly, the number of questions with close votes continues to rise. According the this Meta Stack Overflow post, there were 51.8k close votes as of April 25 2013. In the previous five weeks there has been a deficit of about 400 votes.
Isn't there something that should be done about the close vote system?
As opposed to related question Why is the close vote review queue so full?, which was about why is the queue so full, this question is about the growing queue and what can be done about it.
Date Questions in close vote queue
2012-08-12 55000
2012-08-19 54900
2013-03-03 49300
2013-04-25 51900
2013-06-12 54600
2013-06-14 54800
2013-07-04 57900
2013-07-06 58200
2013-07-11 59700
2013-07-19 61600
2013-08-02 66100
2013-08-20 70400
2013-08-30 73800
2013-09-02 74100
2013-09-10 76500
2013-09-18 79600
2013-09-19 80000
2013-09-30 82100
2013-10-02 82800
2013-10-24 86400
2013-11-12 91900
2013-11-13 92900
2013-11-14 93500
2013-11-27 96900
2013-12-03 100100
2013-12-04 100500
2013-12-12 105400
2013-12-13 106000
2013-12-17 102300
2013-12-18 100700
2013-12-20 100100
2014-01-09 103800
2014-01-10 104400
2014-01-13 104600
2014-02-03 113900
2014-02-25 121300
Using the above data:
Average daily increase in vote queue per day (as of 2013-12-03): 94
Average disregarding the two outliers (two data points from '12): 184