#3 RA2, May 2017 #5 RA2, February 2017 #5 RA2, January 2017 #10 RA2, October 2016 #8 RA2 YR, October 2015 #9 RA2, June 2014 #10 RA2, May 2014 #8 RA2 YR, March 2014 #9 RA2 YR, February 2014 #10 RA2, February 2014 #5 RA2 YR, December 2013 #1 RA2 YR, July 2011 #9 RA2, June 2011 #7 RA2 YR, October 2009 #5 RA2, August 2008 #5 RA2 YR, May 2008 #7 RA2 YR, November 2006
Hint: Always make sure you've got enough power plants. Production slows down a lot when you're low on power.