2010-01-05 STRENGTH: 35.3%
2010-01-06 STRENGTH: 39.7%
2010-01-07 STRENGTH: 45.2%
2010-01-08 STRENGTH: 48.2%
2010-01-11 STRENGTH: 35.7%
2010-01-12 STRENGTH: 17.6%
2010-01-13 STRENGTH: 23.1%
2010-01-14 STRENGTH: 42.1%
2010-01-15 STRENGTH: 31.8%
2010-01-19 STRENGTH: 45.5%
2010-01-20 STRENGTH: 40.0%
2010-01-21 STRENGTH: 20.6%
2010-01-22 STRENGTH: 13.0%
2010-01-25 STRENGTH: 16.1%
2010-01-26 STRENGTH: 17.6%
2010-01-27 STRENGTH: 19.6%
2010-01-28 STRENGTH: 19.2%
2010-01-29 STRENGTH: 16.7%
2010-02-01 STRENGTH: 31.5%
2010-02-02 STRENGTH: 40.6%
2010-02-03 STRENGTH: 27.9%
2010-02-04 STRENGTH: 10.1%
2010-02-05 STRENGTH: 31.5%
2010-02-08 STRENGTH: 21.9%
2010-02-09 STRENGTH: 29.6%
2010-02-10 STRENGTH: 24.7%
2010-02-11 STRENGTH: 46.0%
2010-02-12 STRENGTH: 51.0%
2010-02-16 STRENGTH: 59.9%
2010-02-17 STRENGTH: 44.5%
2010-02-18 STRENGTH: 53.8%
2010-02-19 STRENGTH: 42.0%
2010-02-22 STRENGTH: 27.3%
2010-02-23 STRENGTH: 22.7%
2010-02-24 STRENGTH: 34.8%
2010-02-25 STRENGTH: 44.9%
2010-02-26 STRENGTH: 42.8%
2010-03-01 STRENGTH: 50.2%

2010-04-15 STRENGTH: 42.4%
2010-04-16 STRENGTH: 22.8%
2010-04-19 STRENGTH: 36.9%
2010-04-20 STRENGTH: 43.4%
2010-04-21 STRENGTH: 37.7%
2010-04-22 STRENGTH: 54.0%
2010-04-23 STRENGTH: 57.8%
2010-04-26 STRENGTH: 37.7%
2010-04-27 STRENGTH: 14.5%
2010-04-28 STRENGTH: 25.3%
2010-04-29 STRENGTH: 30.6%
2010-04-30 STRENGTH: 12.7%
2010-05-03 STRENGTH: 28.2%
2010-05-04 STRENGTH: 16.9%
2010-05-05 STRENGTH: 36.7%
2010-05-06 STRENGTH: 12.7%
2010-05-07 STRENGTH: 22.7%
2010-05-10 STRENGTH: 32.7%
2010-05-11 STRENGTH: 39.2%
2010-05-12 STRENGTH: 49.0%
2010-05-13 STRENGTH: 21.8%
2010-05-14 STRENGTH: 34.5%
2010-05-17 STRENGTH: 28.0%
==== End of Performance Assessment (#symbols: 498) for PF: SP500

My feeling is 20% or lower is a red warning.