Some of the ARRL PPX charts
April 2021 here
November 2020 here
April 2020 here
November 2019 here
April 2013 ppx error chart here
November 2012 ppx error chart here
April 2012 ppx error chart here
April 2011 ppx error chart here
November 2010 ppx error chart here
April 2010 ppx error chart here