​Year of Test
1985	1994	2003	2012
1986	1995	2004	​2013
1987	1996	2005	2014
1988	1997	2006	2015
1989	1998	2007	2016
1990	1999	2008	2017
1991	2000	2009	2018
1992	2001	2010	2019
1993	2002	2011	2020