Oil services companies (ETF equiv = XES) have had robust seasonal strength from Feb - May
1986 -5.5%
1987 13.0%
1988 15.0%
1989 11.4%
1990 9.4%
1991 10.2%
1992 3.3%
1993 23.8%
1994 -2.8%
1995 21.4%
1996 17.7%
1997 -5.5%
1998 30.5%
1999 65.2%
2000 32.0%
2001 7.2%
2002 28.3%
2003 2.7%
2004 3.4%
2005 4.4%
2006 5.6%
2007 17.7%
2008 9.9%
2009 25.7%
2010 9.0%
2011 5.4%
2012 -1.5%
2013 -2.5%
2014 15.6%
2015 12.8%
2016 ?
