How many new Boeing 737 aircraft are built a year?

Boeing made the following statements in relation to the 737 productrion rate. At the time of the statements, the production rate was 31.5/month:

May 2010

Production will rise to 34/month in early 2012.

June 2010

Production will rise to 35/month in early 2012.

September 2010

Production will rise to 38/month in the second quarter of 2013.