Annual Reports Documents Add Files 2021 Letter to Shareholders 6.6 MB Add Files 2020 Letter to Shareholders 9.6 MB Add Files 2019 Letter to Shareholders 199.7 KB Add Files 2018 Letter to Shareholders 931.2 KB Add Files 2017 Letter to Shareholders 96.1 KB Add Files 2016 Letter to Shareholders 119.1 KB Add Files 2015 Annual Report 3.3 MB Add Files 2014 Annual Report 1.4 MB Add Files 2013 Annual Report 2.6 MB Add Files 2012 Annual Report 1 MB Filing date Form Mar 16, 2007 10-K Mar 29, 1996 10-K Mar 30, 2001 10-K Mar 21, 2006 10-K Feb 27, 2015 10-K Feb 26, 2020 10-K Mar 08, 2010 10-K Apr 01, 1999 10-K Mar 09, 2004 10-K Mar 05, 2013 10-K