Year Time Period Date Ended 2022 Six Months December 31 Six Months June 30 2021 Six Months December 31 Six Months June 30 2020 Six Months December 31 Six Months June 30 2019 Six months December 31 2018 Six months December 31 Six months June 30 2017 Six months December 31 2017 Six months June 30 2016 Six months June 30 2015 Six months December 31 2014 Six Months December 31 2013 Six Months December 31 Six Months June 30 2012 Six Months December 31 Six Months June 30 2011 Six Months December 31 Nine Months September 30 Six Months June 30 2010 Six Months December 31 Six Months June 30 Six Months June 30 2009 Six Months December 31 Six Months June 30 2008 Six Months December 31 Six Months June 30 2007 Six Months December 31 Six Months June 30 2006 Six Months June 30 2005 Six Months December 31 Six Months June 30 2004 Six Months December 31 Six Months June 30